Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:4:15: error: 'n' was not declared in this scope
    4 |   scanf("%d",&n);
      |               ^
a.cc:5:28: error: expected primary-expression before '?' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                            ^
a.cc:5:29: error: expected primary-expression before '?' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                             ^
a.cc:5:30: error: expected primary-expression before ',' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                              ^
a.cc:5:35: error: expected primary-expression before '?' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                   ^
a.cc:5:36: error: expected primary-expression before '?' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                    ^
a.cc:5:37: error: expected primary-expression before '?' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                     ^
a.cc:5:38: error: expected primary-expression before '?' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                      ^
a.cc:5:39: error: expected primary-expression before '?' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                       ^
a.cc:5:40: error: expected primary-expression before ';' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                        ^
a.cc:5:40: error: expected ':' before ';' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                        ^
      |                                        :
a.cc:5:40: error: expected primary-expression before ';' token
a.cc:5:40: error: expected ':' before ';' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                        ^
      |                                        :
a.cc:5:40: error: expected primary-expression before ';' token
a.cc:5:40: error: expected ':' before ';' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                        ^
      |                                        :
a.cc:5:40: error: expected primary-expression before ';' token
a.cc:5:40: error: expected ':' before ';' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                        ^
      |                                        :
a.cc:5:40: error: expected primary-expression before ';' token
a.cc:5:40: error: expected ':' before ';' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                        ^
      |                                        :
a.cc:5:40: error: expected primary-expression before ';' token
a.cc:5:40: error: expected ':' before ';' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                        ^
      |                                        :
a.cc:5:40: error: expected primary-expression before ';' token
a.cc:5:40: error: expected ':' before ';' token
    5 |   printf("%d %d??????",r*r*??,2*r*?????;
      |                                        ^
      |                                        :
a.cc:5:40: error: expected primary-expression before ';' token