criyle/codenet-compile-errors huggingface dataset:
Language: C

#include<stdio.h>

#define_USE_<ATH_DEFINES

#include<math.h>

int main(void)

{

 double x, y, r;

 scanf("%lf",&r);

 x = r*r*M_PI;

 y = 2*r*M_PI;

 printf("%lf %lf\n",x,y);

 return 0;

}

Compiler output:
main.c:3:2: error: invalid preprocessing directive #define_USE_
    3 | #define_USE_<ATH_DEFINES
      |  ^~~~~~~~~~~
Language: C

#include<stdio.h>

int main(void){

doubule r;

scanf("%lf",&r);

printf("%lf %lf\n",r*r*3.14159265359,2*r*3.14159265359);

return 0;

}

Compiler output:
main.c: In function 'main':
main.c:5:1: error: unknown type name 'doubule'; did you mean 'double'?
    5 | doubule r;
      | ^~~~~~~
      | double
Language: C

#include<stdio.h>

int main(void){

double a,b,r;      

scanf("%d",&r);

	
	if(r>0&&r10000){
 a=r*r*3.141592653589;

 b=2*r*3.141592653589;    

		
 printf("%lf %lf",a,b);  
	}
return 0;

}

Compiler output:
main.c: In function 'main':
main.c:10:17: error: 'r10000' undeclared (first use in this function)
   10 |         if(r>0&&r10000){
      |                 ^~~~~~
main.c:10:17: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
int main(void){
double r;
double M_Pl=3,14159265359,menseki=0,enshu=0;
scanf("%lf",&r);
menseki=r*r*M_Pl;
enshu=2*r*M_Pl;
printf("%.6lf.%.6lf\n",menseki,enshu);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:15: error: expected identifier or '(' before numeric constant
    4 | double M_Pl=3,14159265359,menseki=0,enshu=0;
      |               ^~~~~~~~~~~
main.c:6:1: error: 'menseki' undeclared (first use in this function)
    6 | menseki=r*r*M_Pl;
      | ^~~~~~~
main.c:6:1: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:1: error: 'enshu' undeclared (first use in this function)
    7 | enshu=2*r*M_Pl;
      | ^~~~~
Language: C

#include<stdio.h>
int main(void){
double r;
double M_Pl=3,14159265359,menseki=0,enshu=0;
scanf("%lf",&r);
menseki=r*r*M_Pl;
enshu=2*r*M_Pl;
printf("%.6lf %.6lf\n",menseki,enshu);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:15: error: expected identifier or '(' before numeric constant
    4 | double M_Pl=3,14159265359,menseki=0,enshu=0;
      |               ^~~~~~~~~~~
main.c:6:1: error: 'menseki' undeclared (first use in this function)
    6 | menseki=r*r*M_Pl;
      | ^~~~~~~
main.c:6:1: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:1: error: 'enshu' undeclared (first use in this function)
    7 | enshu=2*r*M_Pl;
      | ^~~~~
Language: C

#include<stdio.h>
int main(void){
double r;
double M_PI=3,14159265359,menseki=0,enshu=0;
scanf("%lf",&r);
menseki=r*r*M_PI;
enshu=2*r*M_PI;
printf("%.6lf %.6lf\n",menseki,enshu);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:15: error: expected identifier or '(' before numeric constant
    4 | double M_PI=3,14159265359,menseki=0,enshu=0;
      |               ^~~~~~~~~~~
main.c:6:1: error: 'menseki' undeclared (first use in this function)
    6 | menseki=r*r*M_PI;
      | ^~~~~~~
main.c:6:1: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:1: error: 'enshu' undeclared (first use in this function)
    7 | enshu=2*r*M_PI;
      | ^~~~~
Language: C

#include <stdio.h>

int main(){
  int a;
  double pi;

  pi = M_PI;
  scanf("%d", &a);
  printf("%lf %lf\n", a * a * pi, a * 2.0 * pi);

  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:8: error: 'M_PI' undeclared (first use in this function)
    7 |   pi = M_PI;
      |        ^~~~
main.c:7:8: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
int main(void)
{
double r
double M_PI=3.14159265359,menseki=0,enshu=0;
scanf("%lf",&r);
menseki=r*r*M_PI;
enshu=2*r*M_PI;
printf("%.6lf  % 6lf\n",menseki,enshu);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:9: error: expected ';' before 'double'
    4 | double r
      |         ^
      |         ;
    5 | double M_PI=3.14159265359,menseki=0,enshu=0;
      | ~~~~~~   
main.c:6:14: error: 'r' undeclared (first use in this function)
    6 | scanf("%lf",&r);
      |              ^
main.c:6:14: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
int main(void)
{
double r
double M_PI=3.14159265359,menseki=0,enshu=0;
scanf("%lf",&r);
menseki=r*r*M_PI;
enshu=2*r*M_PI;
printf("%.6lf  %.6lf\n",menseki,enshu);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:9: error: expected ';' before 'double'
    4 | double r
      |         ^
      |         ;
    5 | double M_PI=3.14159265359,menseki=0,enshu=0;
      | ~~~~~~   
main.c:6:14: error: 'r' undeclared (first use in this function)
    6 | scanf("%lf",&r);
      |              ^
main.c:6:14: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
int main(void)
{
int r;
double pi;
scanf("%d",&r);
pi=3.141592653589
printf("%f %f\n",r*r*pi,2*r*pi);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:18: error: expected ';' before 'printf'
    7 | pi=3.141592653589
      |                  ^
      |                  ;
    8 | printf("%f %f\n",r*r*pi,2*r*pi);
      | ~~~~~~
Language: C

#include<stdio.h>
int main(void)
{
double r,pi;
scanf("%d",&r);
pi=3.141592653589
printf("%f %f\n",r*r*pi,2*r*pi);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:18: error: expected ';' before 'printf'
    6 | pi=3.141592653589
      |                  ^
      |                  ;
    7 | printf("%f %f\n",r*r*pi,2*r*pi);
      | ~~~~~~
Language: C

#include <stdio.h>
#include <math.h>
int main(void){
    int a,b =0;
    double M_PI=3.141592653589793;
    scanf("%d",&a);
    printf("%f %f\n",M_PI * a * a, 2 * M_PI * a);
    return 0;
}

Compiler output:
In file included from main.c:2:
main.c: In function 'main':
main.c:5:12: error: expected identifier or '(' before numeric constant
    5 |     double M_PI=3.141592653589793;
      |            ^~~~
Language: C

#include <stdio.h>
#include <math.h>
int main(void){
    int a,b =0;
    double M_PI=3.1415926536;
    scanf("%d",&a);
    printf("%f %f\n",M_PI * a * a, 2 * M_PI * a);
    return 0;
}

Compiler output:
In file included from main.c:2:
main.c: In function 'main':
main.c:5:12: error: expected identifier or '(' before numeric constant
    5 |     double M_PI=3.1415926536;
      |            ^~~~
Language: C

#include <stdio.h>

int main (void){

double r,pi=3.141592653589;

scanf("%lf"&r);

printf("%lf%\n",r*r*pi,2*r*pi);

return 0

}

Compiler output:
main.c: In function 'main':
main.c:7:12: error: invalid operands to binary & (have 'char *' and 'double')
    7 | scanf("%lf"&r);
      |       ~~~~~^
      |       |
      |       char *
main.c:11:9: error: expected ';' before '}' token
   11 | return 0
      |         ^
      |         ;
   12 | 
   13 | }
      | ~
Language: C

#include <stdio.h>

int main (void){

double r,pi=3.141592653589;

scanf("%lf",&r);

printf("%lf%\n",r*r*pi,2*r*pi);

return 0

}

Compiler output:
main.c: In function 'main':
main.c:11:9: error: expected ';' before '}' token
   11 | return 0
      |         ^
      |         ;
   12 | 
   13 | }
      | ~
Language: C

#include<stdio.h>

#define PI 3.141592653589793238462643383279502884197169399375

int main(void)
{
??double r;
??double x,y;
??scanf("%lf",&r);
??x=r*r*PI;
??x=2*r*PI;
??printf("%lf %lf\n",x,y);
??return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:1: error: expected expression before '?' token
    7 | ??double r;
      | ^
main.c:8:1: error: expected expression before '?' token
    8 | ??double x,y;
      | ^
main.c:9:1: error: expected expression before '?' token
    9 | ??scanf("%lf",&r);
      | ^
main.c:9:16: error: 'r' undeclared (first use in this function)
    9 | ??scanf("%lf",&r);
      |                ^
main.c:9:16: note: each undeclared identifier is reported only once for each function it appears in
main.c:10:1: error: expected expression before '?' token
   10 | ??x=r*r*PI;
      | ^
main.c:10:3: error: 'x' undeclared (first use in this function)
   10 | ??x=r*r*PI;
      |   ^
main.c:11:1: error: expected expression before '?' token
   11 | ??x=2*r*PI;
      | ^
main.c:12:1: error: expected expression before '?' token
   12 | ??printf("%lf %lf\n",x,y);
      | ^
main.c:12:24: error: 'y' undeclared (first use in this function)
   12 | ??printf("%lf %lf\n",x,y);
      |                        ^
main.c:13:1: error: expected expression before '?' token
   13 | ??return 0;
      | ^
Language: C

#include<stdio.h>

#define PI 3.141592653589

int main(void)
{
??double r;
??double x,y;
??scanf("%lf",&r);
??x=r*r*PI;
??x=2*r*PI;
??printf("%lf %lf\n",x,y);
??return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:1: error: expected expression before '?' token
    7 | ??double r;
      | ^
main.c:8:1: error: expected expression before '?' token
    8 | ??double x,y;
      | ^
main.c:9:1: error: expected expression before '?' token
    9 | ??scanf("%lf",&r);
      | ^
main.c:9:16: error: 'r' undeclared (first use in this function)
    9 | ??scanf("%lf",&r);
      |                ^
main.c:9:16: note: each undeclared identifier is reported only once for each function it appears in
main.c:10:1: error: expected expression before '?' token
   10 | ??x=r*r*PI;
      | ^
main.c:10:3: error: 'x' undeclared (first use in this function)
   10 | ??x=r*r*PI;
      |   ^
main.c:11:1: error: expected expression before '?' token
   11 | ??x=2*r*PI;
      | ^
main.c:12:1: error: expected expression before '?' token
   12 | ??printf("%lf %lf\n",x,y);
      | ^
main.c:12:24: error: 'y' undeclared (first use in this function)
   12 | ??printf("%lf %lf\n",x,y);
      |                        ^
main.c:13:1: error: expected expression before '?' token
   13 | ??return 0;
      | ^
Language: C

main()
{
 double r;
 double p = 3.1415926535

 scanf("%f", &r);

 printf("%f %f", 2 * p * r, p * r * r);

 return 0; 
}

Compiler output:
main.c:1:1: error: return type defaults to 'int' [-Wimplicit-int]
    1 | main()
      | ^~~~
main.c: In function 'main':
main.c:6:2: error: expected ',' or ';' before 'scanf'
    6 |  scanf("%f", &r);
      |  ^~~~~
main.c:8:2: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    8 |  printf("%f %f", 2 * p * r, p * r * r);
      |  ^~~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'printf'
  +++ |+#include <stdio.h>
    1 | main()
main.c:8:2: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
    8 |  printf("%f %f", 2 * p * r, p * r * r);
      |  ^~~~~~
main.c:8:2: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C

#include<stidio.h>
#include<math.h>
int main(void){
	double r,s,l;
	scanf("%lf",&r);
	s = r *r * PIE;
	l = 2 * r * PIE;
	printf("%lf %lf",s,l);
	return 0;
}

Compiler output:
main.c:1:9: fatal error: stidio.h: No such file or directory
    1 | #include<stidio.h>
      |         ^~~~~~~~~~
compilation terminated.
Language: C

#include<stdio.h>
#include<math.h>
int main(void){
	double r,s,l;
	scanf("%lf",&r);
	s = r *r * PIE;
	l = 2 * r * PIE;
	printf("%lf %lf",s,l);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:20: error: 'PIE' undeclared (first use in this function)
    6 |         s = r *r * PIE;
      |                    ^~~
main.c:6:20: note: each undeclared identifier is reported only once for each function it appears in
Language: C

 
#include<stdio.h>

int main(){
	float r, ??=3.141592653589, M, R;
	scanf("%f",&r);
    M = r * r * ??;
	R = 2 * r * ??;
	printf("%f %f\n",M ,R);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:18: warning: trigraph ??= ignored, use -trigraphs to enable [-Wtrigraphs]
    5 |         float r, ??=3.141592653589, M, R;
main.c:5:18: error: expected identifier or '(' before '?' token
    5 |         float r, ??=3.141592653589, M, R;
      |                  ^
main.c:7:5: error: 'M' undeclared (first use in this function)
    7 |     M = r * r * ??;
      |     ^
main.c:7:5: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:17: error: expected expression before '?' token
    7 |     M = r * r * ??;
      |                 ^
main.c:8:9: error: 'R' undeclared (first use in this function)
    8 |         R = 2 * r * ??;
      |         ^
main.c:8:21: error: expected expression before '?' token
    8 |         R = 2 * r * ??;
      |                     ^
Language: C

#include <stdio.h>
#include <math.h>

int main(void)
{
	double shu,men,r;
	scanf("%f",&r);
	shu=r*2.0*M_PI;
	men=r*r*pM_PI;
	printf("%.6lf %.6lf\n",shu,men);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:9:17: error: 'pM_PI' undeclared (first use in this function); did you mean 'M_PI'?
    9 |         men=r*r*pM_PI;
      |                 ^~~~~
      |                 M_PI
main.c:9:17: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
#include<math.h>

int main(){
  double r,s,l;
  scanf'("%lf",&r);
  s=r*r*M_PI;
  l=2*r*M_PI;
  printf("%lf %lf",s,l);
}

Compiler output:
main.c: In function 'main':
main.c:6:8: warning: missing terminating ' character
    6 |   scanf'("%lf",&r);
      |        ^
main.c:6:8: error: missing terminating ' character
    6 |   scanf'("%lf",&r);
      |        ^~~~~~~~~~~~
main.c:6:8: error: expected ';' before 's'
    6 |   scanf'("%lf",&r);
      |        ^
      |        ;
    7 |   s=r*r*M_PI;
      |   ~
Language: C

#include<stdio.h>

int main(){
  double r,s,l,pi;
  scanf("%lf",&r);
  pi=M_PI;
  s=r*r*pi;
  l=2*r*pi;
  printf("%f %f\n",s,l);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:6: error: 'M_PI' undeclared (first use in this function)
    6 |   pi=M_PI;
      |      ^~~~
main.c:6:6: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <iostream>
#include<iomanip>
using namespace std;

int main()
{
    double x;
    double pi = 3,14159265358979;
    cin >> x;
    double z = x*pi*2;
    cout << fixed << setprecision(6) << z*x / 2 << " " << z;
    return 0;
}

Compiler output:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include <stdio.h>

int main()
{
 double x, pi=3.141592653589;
 scanf("%1f",&x);
 printf("%f %f\n", x * x * pi, 2 * x * pi);
 return 0;
}

);

Compiler output:
main.c:11:1: error: expected identifier or '(' before ')' token
   11 | );
      | ^
Language: C

#include <stdio.h>

int main()
{
 double r, pi=3.141592653589;
 scanf("%1f", &x);
 printf("%f %f\n", pi * r * r, 2 * r * pi);
 return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:16: error: 'x' undeclared (first use in this function)
    6 |  scanf("%1f", &x);
      |                ^
main.c:6:16: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>

int main()
{
 double r, pi=3.141592653589;
 scanf("%lf", &x);
 printf("%f %f\n", pi * r * r, 2 * r * pi);
 return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:16: error: 'x' undeclared (first use in this function)
    6 |  scanf("%lf", &x);
      |                ^
main.c:6:16: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>

int main()
{
  double r, pi = 3.141592653589;
    scanf("%lf", &r);
 scanf("%f", &x);
 printf("%f\n%f\n", x * x * pi, 2 * x * pi);
 return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:15: error: 'x' undeclared (first use in this function)
    7 |  scanf("%f", &x);
      |               ^
main.c:7:15: note: each undeclared identifier is reported only once for each function it appears in
Language: C

include <stdio.h>

int main(void)
{
	double r;
	scanf("%lf",&r);
	printf("%f %f\n",r*r*3.141592653589,r*2*3.141592653589);
	return 0;
}

Compiler output:
main.c:1:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    1 | include <stdio.h>
      |         ^
Language: C

#include <stdio.h>

int main(void)
int math(void)
{
	double r;
	double menseki;
	double syuu;
	
	scanf("%lf",&r);
	
	menseki=r*r*3.1415926535;
	syuu=r*2*3.1415926535;
	
	printf("%lf %lf", menseki, syuu);
	
	return (0);
}

Compiler output:
main.c: In function 'main':
main.c:5:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
    5 | {
      | ^
main.c:19: error: expected '{' at end of input
Language: C

#include <stdio.h>
#include <math.h>

int main(void)

{
	double r;
	double menseki;
	double syuu;
	
	scanf("%lf",&r);
	
	menseki=r*r*3.1415926535897932;
	syuu=2*r*3.1415926535897932;
	
	printf("%lf %lf\n", menseki, syuu);
	
	return (0);

Compiler output:
main.c: In function 'main':
main.c:18:9: error: expected declaration or statement at end of input
   18 |         return (0);
      |         ^~~~~~
Language: C

#include <stdio.h>


int main(void)
 {

	double r;
	double cir,area;

	scanf("%lf", &r);
	cir=2*r*3.14;
	area??????*???*3.14;
	
	printf("%f %f\n", are, circ);


	return 0;

}

Compiler output:
main.c: In function 'main':
main.c:12:14: error: expected expression before '?' token
   12 |         area??????*???*3.14;
      |              ^
main.c:12:23: error: invalid type argument of unary '*' (have 'double')
   12 |         area??????*???*3.14;
      |                       ^~~~~
main.c:14:27: error: 'are' undeclared (first use in this function); did you mean 'area'?
   14 |         printf("%f %f\n", are, circ);
      |                           ^~~
      |                           area
main.c:14:27: note: each undeclared identifier is reported only once for each function it appears in
main.c:14:32: error: 'circ' undeclared (first use in this function); did you mean 'cir'?
   14 |         printf("%f %f\n", are, circ);
      |                                ^~~~
      |                                cir
Language: C

#include <stdio.h>


int main(void)
 {

	double r, l, s;

	scanf("%lf", &r);
	l=2*r*3.141592653589;
	s??????*???*3.141592653589;
	
	printf("%f %f\n", s, l);


	return 0;

}

Compiler output:
main.c: In function 'main':
main.c:11:11: error: expected expression before '?' token
   11 |         s??????*???*3.141592653589;
      |           ^
main.c:11:20: error: invalid type argument of unary '*' (have 'double')
   11 |         s??????*???*3.141592653589;
      |                    ^~~~~~~~~~~~~~~
Language: C

#include <stdio.h>


int main(void)
 {

	double r, l, s;

	scanf("%lf", &r);
	l=2*r*3.141592653589;
	s=???*???*3.141592653589;
	
	printf("%f %f\n", s, l);


	return 0;

}

Compiler output:
main.c: In function 'main':
main.c:11:11: error: expected expression before '?' token
   11 |         s=???*???*3.141592653589;
      |           ^
main.c:11:18: error: invalid type argument of unary '*' (have 'double')
   11 |         s=???*???*3.141592653589;
      |                  ^~~~~~~~~~~~~~~
Language: C

#include<stdio.h>
#define pai 3.14
int main(void)
{
        int r;
        printf("%f %f\n",r*r*pai,2*r*pai);
        return 0;
}
~     

Compiler output:
main.c:9:1: error: expected identifier or '(' before '~' token
    9 | ~
      | ^
Language: C

#include<stdio.h>
#define pai 3.14
int main(void)
{
        float r;
        printf("%f %f\n",r*r*pai,2*r*pai);
        return 0;
}
~     

Compiler output:
main.c:9:1: error: expected identifier or '(' before '~' token
    9 | ~
      | ^
Language: C

#include<stdio.h>
#include<math.h>
int main(void)
{
        float r;
        printf("%f %f\n",r*r*M_PI,2*r*M_PI);
        return 0;
}
~          

Compiler output:
main.c:9:1: error: expected identifier or '(' before '~' token
    9 | ~
      | ^
Language: C

#include<stdio.h>
#include<math.h>
int main(void)
{
        float r;
        scanf("%d",&r);
        printf("%f %f\n",r*r*M_PI,2*r*M_PI);
        return 0;
}
~            

Compiler output:
main.c:10:1: error: expected identifier or '(' before '~' token
   10 | ~
      | ^
Language: C

#include<stdio.h>
#include<math.h>
int main(void)
{
        float r;
        scanf("%f",&r);
        printf("%f %f\n",r*r*M_PI,2*r*M_PI);
        return 0;
}
~      

Compiler output:
main.c:10:1: error: expected identifier or '(' before '~' token
   10 | ~
      | ^
Language: C

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
int main(void){
    double num;
    //????????\???
    scanf("%lf",&num);
    double M_PI=3.14159265358979323846;
    double circumference=num*2*M_PI;
    double circlearea=num*num*M_PI;
    
    printf("%.6f %.6f\n",circlearea,circumference);

return 0;
}

Compiler output:
In file included from main.c:3:
main.c: In function 'main':
main.c:9:12: error: expected identifier or '(' before numeric constant
    9 |     double M_PI=3.14159265358979323846;
      |            ^~~~
Language: C

#include<stdio.h>
int main()
{
double r;
double pi=acos(-1)
scanf("%lf",&r);
printf("%f %f\n",r*r*pi,2*r*pi);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:11: error: implicit declaration of function 'acos' [-Wimplicit-function-declaration]
    5 | double pi=acos(-1)
      |           ^~~~
main.c:2:1: note: include '<math.h>' or provide a declaration of 'acos'
    1 | #include<stdio.h>
  +++ |+#include <math.h>
    2 | int main()
main.c:5:11: warning: incompatible implicit declaration of built-in function 'acos' [-Wbuiltin-declaration-mismatch]
    5 | double pi=acos(-1)
      |           ^~~~
main.c:5:11: note: include '<math.h>' or provide a declaration of 'acos'
main.c:6:1: error: expected ',' or ';' before 'scanf'
    6 | scanf("%lf",&r);
      | ^~~~~
Language: C

#include <stdio.h>
int main()
{
  double r;
  scanf("%d",&lr);
  if(r>0 && r<10000)
  printf("%9.6f %9.6f\n",(double)r*r*3.1415926,(double)r*2*3.1415926);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:15: error: 'lr' undeclared (first use in this function); did you mean 'r'?
    5 |   scanf("%d",&lr);
      |               ^~
      |               r
main.c:5:15: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
int main()
{
  double r;
  scanf("%d",&lr);
  if(r>0 && r<10000)
  printf("%9.6lf %9.6lf\n",(double)r*r*3.1415926,(double)r*2*3.1415926);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:15: error: 'lr' undeclared (first use in this function); did you mean 'r'?
    5 |   scanf("%d",&lr);
      |               ^~
      |               r
main.c:5:15: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
int main()
{
  double r;
  scanf("%lf",&lr);
  if(r>0 && r<10000)
  printf("%9.6f %9.6f\n",(double)r*r*3.1415926,(double)r*2*3.1415926);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:16: error: 'lr' undeclared (first use in this function); did you mean 'r'?
    5 |   scanf("%lf",&lr);
      |                ^~
      |                r
main.c:5:16: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
int main()
{
  double r,??;
  ??=3.141592653582148086514428810975;
  scanf("%lf",&r);
  if(r>0 && r<10000)printf("%.6f %.6f\n",(double)r*r*??,(double)r*2*??);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:12: error: expected identifier or '(' before '?' token
    4 |   double r,??;
      |            ^
main.c:5:3: warning: trigraph ??= ignored, use -trigraphs to enable [-Wtrigraphs]
    5 |   ??=3.141592653582148086514428810975;
main.c:5:3: error: expected expression before '?' token
    5 |   ??=3.141592653582148086514428810975;
      |   ^
main.c:7:54: error: expected expression before '?' token
    7 |   if(r>0 && r<10000)printf("%.6f %.6f\n",(double)r*r*??,(double)r*2*??);
      |                                                      ^
main.c:7:69: warning: trigraph ??) ignored, use -trigraphs to enable [-Wtrigraphs]
    7 |   if(r>0 && r<10000)printf("%.6f %.6f\n",(double)r*r*??,(double)r*2*??);
Language: C

#include<stdio.h>
int main(void){
    double r,S,f;
    scanf("%lf",&r);
    S=r*r*3.141592653589
    f=2*r*3.141592653589
    printf("%f %f\n",S,f);
    return o
}

Compiler output:
main.c: In function 'main':
main.c:5:25: error: expected ';' before 'f'
    5 |     S=r*r*3.141592653589
      |                         ^
      |                         ;
    6 |     f=2*r*3.141592653589
      |     ~                    
main.c:8:12: error: 'o' undeclared (first use in this function)
    8 |     return o
      |            ^
main.c:8:12: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:13: error: expected ';' before '}' token
    8 |     return o
      |             ^
      |             ;
    9 | }
      | ~
Language: C


#include <stdio.h>

int main(void)
{
	int r;
	double area,len;

	scanf("%d",&r);

	len = 2 * r * 3.14;
	area = r^2 * 3.14;

	printf("%f %f",area len);
	return 0;
	
}

Compiler output:
main.c: In function 'main':
main.c:12:17: error: invalid operands to binary ^ (have 'int' and 'double')
   12 |         area = r^2 * 3.14;
      |                 ^~~~~~~~~
      |                    |
      |                    double
main.c:14:28: error: expected ')' before 'len'
   14 |         printf("%f %f",area len);
      |               ~            ^~~~
      |                            )
Language: C

#include <stdio.h>

int main(void)
{
	int r;
	double area,len;

	scanf("%d",&r);

	len = 2 * r * 3.14;
	area = r^2 * 3.14;

	printf("%f %f",area,len);
	return 0;

}

Compiler output:
main.c: In function 'main':
main.c:11:17: error: invalid operands to binary ^ (have 'int' and 'double')
   11 |         area = r^2 * 3.14;
      |                 ^~~~~~~~~
      |                    |
      |                    double
Language: C

include <stdio.h>
#include <math.h>

int main(void)
{
	
	double r,area,len;

	scanf("%f",&r);

	len = 2 * r * M_PI;
	area = r * r * M_PI;

	printf("%f %f",area,len);
	return 0;

}

Compiler output:
main.c:1:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    1 | include <stdio.h>
      |         ^
main.c: In function 'main':
main.c:9:9: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    9 |         scanf("%f",&r);
      |         ^~~~~
main.c:3:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
    2 | #include <math.h>
  +++ |+#include <stdio.h>
    3 | 
main.c:9:9: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    9 |         scanf("%f",&r);
      |         ^~~~~
main.c:9:9: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:14:9: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   14 |         printf("%f %f",area,len);
      |         ^~~~~~
main.c:14:9: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:14:9: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:14:9: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C

#include <iostream>
#include <stdio.h>
using namespace std;

int main()
{
  double r,p = 3.141592653589;

  cin >> r;

  printf("%lf %lf\n",r*r*p,2*r*p);

  return 0;
}

Compiler output:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include<stdio.h>

main(){
	double r,;
	
	scanf("%f", &r);
	
	printf("%f %f", r*r*3.1415, 2*r*3.1415);
	
	return 0;
}

Compiler output:
main.c:3:1: error: return type defaults to 'int' [-Wimplicit-int]
    3 | main(){
      | ^~~~
main.c: In function 'main':
main.c:4:18: error: expected identifier or '(' before ';' token
    4 |         double r,;
      |                  ^
Language: C

int main(void){
 double r = 0;
 double l = 0;
 double s = 0;
 double pai = 3.1415926535
 
 scanf("%d",&r);
 l = 2 * r * pai;
 s = r * r * pai;

 printf("%.6lf %.6lf\n",l,s);
 return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:2: error: expected ',' or ';' before 'scanf'
    7 |  scanf("%d",&r);
      |  ^~~~~
main.c:11:2: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   11 |  printf("%.6lf %.6lf\n",l,s);
      |  ^~~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'printf'
  +++ |+#include <stdio.h>
    1 | int main(void){
main.c:11:2: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
   11 |  printf("%.6lf %.6lf\n",l,s);
      |  ^~~~~~
main.c:11:2: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C

int main(void){
 double r = 0;
 double l = 0;
 double s = 0;
 double pai = 3.1415926535
  
 scanf("%f",&r);
 l = 2 * r * pai;
 s = r * r * pai;
 
 printf("%.6lf %.6lf\n",l,s);
 return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:2: error: expected ',' or ';' before 'scanf'
    7 |  scanf("%f",&r);
      |  ^~~~~
main.c:11:2: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   11 |  printf("%.6lf %.6lf\n",l,s);
      |  ^~~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'printf'
  +++ |+#include <stdio.h>
    1 | int main(void){
main.c:11:2: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
   11 |  printf("%.6lf %.6lf\n",l,s);
      |  ^~~~~~
main.c:11:2: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C

int main(void){
 double a = 0;
 double b = 0;
 double s = 0;
 double l = 0;
 double pai = 3.1415926535;
 
 scanf("%d %d",&a,&b);
 s = r * r * pai;
 l = 2 * r * pai;
 
 printf("%d %d %.5lf\n", d, r, f);
 return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:2: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    8 |  scanf("%d %d",&a,&b);
      |  ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | int main(void){
main.c:8:2: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    8 |  scanf("%d %d",&a,&b);
      |  ^~~~~
main.c:8:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:9:6: error: 'r' undeclared (first use in this function)
    9 |  s = r * r * pai;
      |      ^
main.c:9:6: note: each undeclared identifier is reported only once for each function it appears in
main.c:12:2: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   12 |  printf("%d %d %.5lf\n", d, r, f);
      |  ^~~~~~
main.c:12:2: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:12:2: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:12:2: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:12:26: error: 'd' undeclared (first use in this function)
   12 |  printf("%d %d %.5lf\n", d, r, f);
      |                          ^
main.c:12:32: error: 'f' undeclared (first use in this function)
   12 |  printf("%d %d %.5lf\n", d, r, f);
      |                                ^
Language: C

int main(void){
 double r = 0;
 double s = 0;
 double l = 0;
 double pai = 3.1415926535;
  
 scanf("%d %d",&r);
 s = r * r * pai;
 l = 2 * r * pai;
  
 printf("%d %d %.5lf\n", d, r, f);
 return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:2: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    7 |  scanf("%d %d",&r);
      |  ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | int main(void){
main.c:7:2: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    7 |  scanf("%d %d",&r);
      |  ^~~~~
main.c:7:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:11:2: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   11 |  printf("%d %d %.5lf\n", d, r, f);
      |  ^~~~~~
main.c:11:2: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:11:2: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:11:2: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:11:26: error: 'd' undeclared (first use in this function)
   11 |  printf("%d %d %.5lf\n", d, r, f);
      |                          ^
main.c:11:26: note: each undeclared identifier is reported only once for each function it appears in
main.c:11:32: error: 'f' undeclared (first use in this function)
   11 |  printf("%d %d %.5lf\n", d, r, f);
      |                                ^
Language: C

#include <stdio.h>
#define pi 3.1415926536
????
int main ()
{
??????????int r;
??????????long double s, l;
??????????scanf("%d", &r);
??????????s = r * r * pi;
??????????l = 2 * r * pi;
??????????printf("%f %f\n", s, l);
??????????return 0;
}

Compiler output:
main.c:3:1: error: expected identifier or '(' before '?' token
    3 | ????
      | ^
Language: C

#include <stdio.h>
#define pi 3.1415926536
????
int main ()
{
int r;
long double s, l;
scanf("%d", &r);
s = r * r * pi;
l = 2 * r * pi;
printf("%f %f\n", s, l);
return 0;
}

Compiler output:
main.c:3:1: error: expected identifier or '(' before '?' token
    3 | ????
      | ^
Language: C

#include <stdio.h>
#define pi 3.1415926536
????
int main ( void )
{
??????????int r;
??????????long double s, l;
??????????scanf("%d", &r);
??????????s = r * r * pi;
??????????l = 2 * r * pi;
??????????printf("%f %f\n", s, l);
??????????return 0;
}

Compiler output:
main.c:3:1: error: expected identifier or '(' before '?' token
    3 | ????
      | ^
Language: C

#include <stdio.h>
#define pi 3.1415926536
????
int main ()
{
??????????long double r, s, l;
??????????scanf("%lf", &r);
??????????s = r * r * pi;
??????????l = 2 * r * pi;
??????????printf("%f %f\n", s, l);
??????????return 0;
}

Compiler output:
main.c:3:1: error: expected identifier or '(' before '?' token
    3 | ????
      | ^
Language: C

#include <stdio.h>
int main(void){
double r;
printf("%d %d\n",r*r*3.1415926535,2*r*3.1415926535)
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:52: error: expected ';' before 'return'
    4 | printf("%d %d\n",r*r*3.1415926535,2*r*3.1415926535)
      |                                                    ^
      |                                                    ;
    5 | return 0;
      | ~~~~~~
Language: C

#include <stdio.h>
int main(void){
double r;
printf("%f %f\n",r*r*3.1415926535,2*r*3.1415926535)
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:52: error: expected ';' before 'return'
    4 | printf("%f %f\n",r*r*3.1415926535,2*r*3.1415926535)
      |                                                    ^
      |                                                    ;
    5 | return 0;
      | ~~~~~~
Language: C

#include <stdio.h>
int main(void){
double r;
double pi=3.14159265358979
printf("%f %f\n",r*r*pi,2*r*pi)
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:1: error: expected ',' or ';' before 'printf'
    5 | printf("%f %f\n",r*r*pi,2*r*pi)
      | ^~~~~~
Language: C

#include <stdio.h>
int main(void){
double r;
double pi=3.14159265358979
printf("%f %f\n",r*r*pi,2*r*pi);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:1: error: expected ',' or ';' before 'printf'
    5 | printf("%f %f\n",r*r*pi,2*r*pi);
      | ^~~~~~
Language: C

#include <stdio.h>
??????????????????
int main(void){
??????????float r;
??????????scanf("%f",&r);
??????????printf("%f %f\n",r*r*3.1415926535,2*r*3.1415926535);
??????????return 0;
}

Compiler output:
main.c:2:1: error: expected identifier or '(' before '?' token
    2 | ??????????????????
      | ^
Language: C

#include <stdio.h>

int main(void){
float r;
scanf("%f,&r);
printf("%f %f\n",r*r*3.1415926535,2*r*3.1415926535);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:7: warning: missing terminating " character
    5 | scanf("%f,&r);
      |       ^
main.c:5:7: error: missing terminating " character
    5 | scanf("%f,&r);
      |       ^~~~~~~~
main.c:6:52: error: expected ')' before ';' token
    6 | printf("%f %f\n",r*r*3.1415926535,2*r*3.1415926535);
      |                                                    ^
      |                                                    )
main.c:5:6: note: to match this '('
    5 | scanf("%f,&r);
      |      ^
main.c:6:1: error: passing argument 1 of 'scanf' makes pointer from integer without a cast [-Wint-conversion]
    6 | printf("%f %f\n",r*r*3.1415926535,2*r*3.1415926535);
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      | |
      | int
In file included from main.c:1:
/usr/include/stdio.h:428:42: note: expected 'const char *' but argument is of type 'int'
  428 | extern int scanf (const char *__restrict __format, ...) __wur;
      |                   ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
main.c:7:10: error: expected ';' before '}' token
    7 | return 0;
      |          ^
      |          ;
    8 | }
      | ~
Language: C

#include <stdio.h>
??????
int main(void){
float r s l;
scanf("%f",&r);
s = r*r*3.1415926535;
l = 2*r*3.1415926535;
printf("%f %f\n",s,l);
return 0;
}

Compiler output:
main.c:2:1: error: expected identifier or '(' before '?' token
    2 | ??????
      | ^
Language: C

#include <stdio.h>
????
int main(void){
????
??????double r;
??????scanf("%lf",&r);
??????printf("%f %f\n",2*r*3.1415926535,r*r*3.1415926535);
????
??????return 0;
}

Compiler output:
main.c:2:1: error: expected identifier or '(' before '?' token
    2 | ????
      | ^
Language: C

#include <stdio.h>
int main(void){
??
??????????double r;
??????????scanf("%lf",&r);
??????????printf("%f %f\n",2*r*3.141592653589,r*r*3.141592653589);
??
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:3:1: error: expected expression before '?' token
    3 | ??
      | ^
main.c:5:1: error: expected expression before '?' token
    5 | ??????????scanf("%lf",&r);
      | ^
main.c:5:24: error: 'r' undeclared (first use in this function)
    5 | ??????????scanf("%lf",&r);
      |                        ^
main.c:5:24: note: each undeclared identifier is reported only once for each function it appears in
main.c:6:1: error: expected expression before '?' token
    6 | ??????????printf("%f %f\n",2*r*3.141592653589,r*r*3.141592653589);
      | ^
main.c:6:66: error: expected ':' before ';' token
    6 | ??????????printf("%f %f\n",2*r*3.141592653589,r*r*3.141592653589);
      |                                                                  ^
      |                                                                  :
main.c:7:1: error: expected expression before '?' token
    7 | ??
      | ^
Language: C

#include <stdio.h>
#include <math.h>
int main(void)
{
double r;
scanf("%lf", &r);
printf("%lf %lf",M_PI*r*r,2.0*M_PIi*r);
}

Compiler output:
main.c: In function 'main':
main.c:7:31: error: 'M_PIi' undeclared (first use in this function); did you mean 'M_PI'?
    7 | printf("%lf %lf",M_PI*r*r,2.0*M_PIi*r);
      |                               ^~~~~
      |                               M_PI
main.c:7:31: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>

int main()
{
double pi,area,circum,r;
pi=3.14
scanf("%lf",&r);
area = pi*r*r;
circum = 2*pi*r;
printf("%f %f\n",area,circum);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:8: error: expected ';' before 'scanf'
    6 | pi=3.14
      |        ^
      |        ;
    7 | scanf("%lf",&r);
      | ~~~~~
Language: C

#include<stdio.h>

int main()
{
double pi,area,circum,r;
pi=3.14
scanf("%lf\n",&r);
area = pi*r*r;
circum = 2*pi*r;
printf("%f %f\n",area,circum);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:8: error: expected ';' before 'scanf'
    6 | pi=3.14
      |        ^
      |        ;
    7 | scanf("%lf\n",&r);
      | ~~~~~
Language: C

#include<stdio.h>

int main()
{
double pi,r;
pi=3.14
scanf("%lf\n",&r);
printf("%f %f\n",pi*r*r, 2*pi*r);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:8: error: expected ';' before 'scanf'
    6 | pi=3.14
      |        ^
      |        ;
    7 | scanf("%lf\n",&r);
      | ~~~~~
Language: C

#include<stdio.h>

int main()
{
double pi,r;
pi=3.14
scanf("%lf\n",&r);
printf("%f %f\n",pi*r*r, 2*pi*r*2);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:8: error: expected ';' before 'scanf'
    6 | pi=3.14
      |        ^
      |        ;
    7 | scanf("%lf\n",&r);
      | ~~~~~
Language: C

int main(){
int a
float b,c,d;
scanf("%d",&a);
b=3.141592654;
c=b*a*a;
d=2*b*a;
printf("%f %f\n", c, b);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:2:6: error: expected ';' before 'float'
    2 | int a
      |      ^
      |      ;
    3 | float b,c,d;
      | ~~~~~ 
main.c:4:1: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    4 | scanf("%d",&a);
      | ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | int main(){
main.c:4:1: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    4 | scanf("%d",&a);
      | ^~~~~
main.c:4:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:4:13: error: 'a' undeclared (first use in this function)
    4 | scanf("%d",&a);
      |             ^
main.c:4:13: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:1: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    8 | printf("%f %f\n", c, b);
      | ^~~~~~
main.c:8:1: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:8:1: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:8:1: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C

#include <stdio.h>
//#define PI 3.1415926535897932384626433
int main(){
double r;
scanf("%lf\n", &r);
printf("%f %f\n", 2*PI*r, PI*r*r);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:21: error: 'PI' undeclared (first use in this function)
    6 | printf("%f %f\n", 2*PI*r, PI*r*r);
      |                     ^~
main.c:6:21: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
//#define PI 3.1415926535897932384626433
int main(){
double r;
scanf("%lf\n", &r);
printf("%f %f\n", 2*pi*r, pi*r*r);
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:21: error: 'pi' undeclared (first use in this function)
    6 | printf("%f %f\n", 2*pi*r, pi*r*r);
      |                     ^~
main.c:6:21: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
int main()
{
    int r,p ;
    double a,c,;
    scanf("%d",&r);
    p=3.14159265;
    c=2*p*r;
    a=p*r*r;
    printf("%f %f",a,c);
    return 0 ;
}

Compiler output:
main.c: In function 'main':
main.c:5:16: error: expected identifier or '(' before ';' token
    5 |     double a,c,;
      |                ^
Language: C

#include <stdio.h>

#define ?? 3.141592653589
int main(void)
{
	double r, menseki, nagasa;
	scanf("%lf",&r);
	menseki = ??*r*r;
	nagasa = 2 * ??*r;
	printf("%f %f\n", nagasa, menseki);
	return 0;
}

Compiler output:
main.c:3:9: error: macro names must be identifiers
    3 | #define ?? 3.141592653589
      |         ^
main.c: In function 'main':
main.c:8:19: error: expected expression before '?' token
    8 |         menseki = ??*r*r;
      |                   ^
main.c:8:21: error: invalid type argument of unary '*' (have 'double')
    8 |         menseki = ??*r*r;
      |                     ^~
main.c:9:22: error: expected expression before '?' token
    9 |         nagasa = 2 * ??*r;
      |                      ^
main.c:9:24: error: invalid type argument of unary '*' (have 'double')
    9 |         nagasa = 2 * ??*r;
      |                        ^~
Language: C

#include <stdio.h>
#define ?? 3.141592653589
int main(void)
{
	double r, menseki, nagasa;
	scanf("%lf",&r);
	menseki = ??*r*r;
	nagasa = 2 * ??*r;
	printf("%f %f\n", nagasa, menseki);
	return 0;
}

Compiler output:
main.c:2:9: error: macro names must be identifiers
    2 | #define ?? 3.141592653589
      |         ^
main.c: In function 'main':
main.c:7:19: error: expected expression before '?' token
    7 |         menseki = ??*r*r;
      |                   ^
main.c:7:21: error: invalid type argument of unary '*' (have 'double')
    7 |         menseki = ??*r*r;
      |                     ^~
main.c:8:22: error: expected expression before '?' token
    8 |         nagasa = 2 * ??*r;
      |                      ^
main.c:8:24: error: invalid type argument of unary '*' (have 'double')
    8 |         nagasa = 2 * ??*r;
      |                        ^~
Language: C

#include <stdio.h>
#include <math.h>
 
int main(void){
	double r, s, c;

	for(; r != EOF;)
		scanf("%lf", &r);
		s = r * r * MP_I;
		c = r * 2 * MP_I;
		printf("%.6lf %.6lf\n", s, c);
	}

	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:9:29: error: 'MP_I' undeclared (first use in this function); did you mean 'M_PI'?
    9 |                 s = r * r * MP_I;
      |                             ^~~~
      |                             M_PI
main.c:9:29: note: each undeclared identifier is reported only once for each function it appears in
main.c: At top level:
main.c:14:9: error: expected identifier or '(' before 'return'
   14 |         return 0;
      |         ^~~~~~
main.c:15:1: error: expected identifier or '(' before '}' token
   15 | }
      | ^
Language: C

#include <stdio.h>
#include <math.h>
 
int main(void){
	double r, s, c;

	for(; r != EOF;)
		scanf("%lf", &r);
		s = r * r * M_PI;
		c = r * 2 * M_PI;
		printf("%.6lf %.6lf\n", s, c);
	}

	return 0;
}

Compiler output:
main.c:14:9: error: expected identifier or '(' before 'return'
   14 |         return 0;
      |         ^~~~~~
main.c:15:1: error: expected identifier or '(' before '}' token
   15 | }
      | ^
Language: C

#include <stdio.h>

int main(void)
{
 ddouble r,menseki,syuui;

 scanf("%lf",r);

 menseki = r*r*3.141592653589;
 syuui   = 2*r*3.141592653589;

 printf("%f %f",menseki,syuui);

 return 0;

}

Compiler output:
main.c: In function 'main':
main.c:5:2: error: unknown type name 'ddouble'; did you mean 'double'?
    5 |  ddouble r,menseki,syuui;
      |  ^~~~~~~
      |  double
Language: C

#include<stdio.h>
#include<math.h>
int main() {
	double r,m,e;
	scanf("%lf",&r);
	if(r > 0 && r < 10000) {
		pow(r,2) * PI_M = m;
		2 * r * PI_M = e;
	}
	printf("%f %f\n",m,e);	
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:28: error: 'PI_M' undeclared (first use in this function)
    7 |                 pow(r,2) * PI_M = m;
      |                            ^~~~
main.c:7:28: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
#include<math.h>
int main() {
	double r,m,e;
	scanf("%lf",&r);
	if(r > 0 && r < 10000) {
		pow(r,2.0) * M_PI = m;
		2 * r * M_PI = e;
	}
	printf("%f %f\n",m,e);	
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:35: error: lvalue required as left operand of assignment
    7 |                 pow(r,2.0) * M_PI = m;
      |                                   ^
main.c:8:30: error: lvalue required as left operand of assignment
    8 |                 2 * r * M_PI = e;
      |                              ^
Language: C

#include <stdio.h>
int main(){
double r, a, b, c=3.14159265359;
scanf("%lf",&r);
a=2*r*c;
b=r*r*cI;
printf("%lf %lf\n",a,b);
}

Compiler output:
main.c: In function 'main':
main.c:6:7: error: 'cI' undeclared (first use in this function); did you mean 'c'?
    6 | b=r*r*cI;
      |       ^~
      |       c
main.c:6:7: note: each undeclared identifier is reported only once for each function it appears in