Language: C

#include <stdio.h>
&#160;
int main(){
&#160;&#160;int i,n;
&#160;&#160;double x1,y1,x2,y2,x3,y3,x4,y4,sl1,sl2;
&#160;&#160;scanf("%d",&n);
&#160;&#160;for (i=0;i<n;i++){
&#160;&#160;&#160;&#160;scanf("%lf %lf %lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
&#160;&#160;&#160;&#160;sl1=(y2-y1)/(x2-x1);
&#160;&#160;&#160;&#160;sl2=(y4-y3)/(x4-x3);
&#160;&#160;&#160;&#160;if (sl1==sl2){
&#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
&#160;&#160;&#160;&#160;}else{
&#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
&#160;&#160;&#160;&#160;}
&#160;&#160;}
&#160;&#160;return 0;
}

Compiler output:
main.c:2:1: error: expected identifier or '(' before '&' token
    2 | &#160;
      | ^
main.c:2:2: error: stray '#' in program
    2 | &#160;
      |  ^
main.c: In function 'main':
main.c:4:2: error: stray '#' in program
    4 | &#160;&#160;int i,n;
      |  ^
main.c:4:1: error: lvalue required as unary '&' operand
    4 | &#160;&#160;int i,n;
      | ^
main.c:4:8: error: stray '#' in program
    4 | &#160;&#160;int i,n;
      |        ^
main.c:4:7: error: lvalue required as unary '&' operand
    4 | &#160;&#160;int i,n;
      |       ^
main.c:5:2: error: stray '#' in program
    5 | &#160;&#160;double x1,y1,x2,y2,x3,y3,x4,y4,sl1,sl2;
      |  ^
main.c:5:1: error: lvalue required as unary '&' operand
    5 | &#160;&#160;double x1,y1,x2,y2,x3,y3,x4,y4,sl1,sl2;
      | ^
main.c:5:8: error: stray '#' in program
    5 | &#160;&#160;double x1,y1,x2,y2,x3,y3,x4,y4,sl1,sl2;
      |        ^
main.c:5:7: error: lvalue required as unary '&' operand
    5 | &#160;&#160;double x1,y1,x2,y2,x3,y3,x4,y4,sl1,sl2;
      |       ^
main.c:6:2: error: stray '#' in program
    6 | &#160;&#160;scanf("%d",&n);
      |  ^
main.c:6:1: error: lvalue required as unary '&' operand
    6 | &#160;&#160;scanf("%d",&n);
      | ^
main.c:6:8: error: stray '#' in program
    6 | &#160;&#160;scanf("%d",&n);
      |        ^
main.c:6:7: error: lvalue required as unary '&' operand
    6 | &#160;&#160;scanf("%d",&n);
      |       ^
main.c:7:2: error: stray '#' in program
    7 | &#160;&#160;for (i=0;i<n;i++){
      |  ^
main.c:7:1: error: lvalue required as unary '&' operand
    7 | &#160;&#160;for (i=0;i<n;i++){
      | ^
main.c:7:8: error: stray '#' in program
    7 | &#160;&#160;for (i=0;i<n;i++){
      |        ^
main.c:7:7: error: lvalue required as unary '&' operand
    7 | &#160;&#160;for (i=0;i<n;i++){
      |       ^
main.c:8:2: error: stray '#' in program
    8 | &#160;&#160;&#160;&#160;scanf("%lf %lf %lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
      |  ^
main.c:8:1: error: lvalue required as unary '&' operand
    8 | &#160;&#160;&#160;&#160;scanf("%lf %lf %lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
      | ^
main.c:8:8: error: stray '#' in program
    8 | &#160;&#160;&#160;&#160;scanf("%lf %lf %lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
      |        ^
main.c:8:7: error: lvalue required as unary '&' operand
    8 | &#160;&#160;&#160;&#160;scanf("%lf %lf %lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
      |       ^
main.c:8:14: error: stray '#' in program
    8 | &#160;&#160;&#160;&#160;scanf("%lf %lf %lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
      |              ^
main.c:8:13: error: lvalue required as unary '&' operand
    8 | &#160;&#160;&#160;&#160;scanf("%lf %lf %lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
      |             ^
main.c:8:20: error: stray '#' in program
    8 | &#160;&#160;&#160;&#160;scanf("%lf %lf %lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
      |                    ^
main.c:8:19: error: lvalue required as unary '&' operand
    8 | &#160;&#160;&#160;&#160;scanf("%lf %lf %lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4);
      |                   ^
main.c:9:2: error: stray '#' in program
    9 | &#160;&#160;&#160;&#160;sl1=(y2-y1)/(x2-x1);
      |  ^
main.c:9:1: error: lvalue required as unary '&' operand
    9 | &#160;&#160;&#160;&#160;sl1=(y2-y1)/(x2-x1);
      | ^
main.c:9:8: error: stray '#' in program
    9 | &#160;&#160;&#160;&#160;sl1=(y2-y1)/(x2-x1);
      |        ^
main.c:9:7: error: lvalue required as unary '&' operand
    9 | &#160;&#160;&#160;&#160;sl1=(y2-y1)/(x2-x1);
      |       ^
main.c:9:14: error: stray '#' in program
    9 | &#160;&#160;&#160;&#160;sl1=(y2-y1)/(x2-x1);
      |              ^
main.c:9:13: error: lvalue required as unary '&' operand
    9 | &#160;&#160;&#160;&#160;sl1=(y2-y1)/(x2-x1);
      |             ^
main.c:9:20: error: stray '#' in program
    9 | &#160;&#160;&#160;&#160;sl1=(y2-y1)/(x2-x1);
      |                    ^
main.c:9:19: error: lvalue required as unary '&' operand
    9 | &#160;&#160;&#160;&#160;sl1=(y2-y1)/(x2-x1);
      |                   ^
main.c:10:2: error: stray '#' in program
   10 | &#160;&#160;&#160;&#160;sl2=(y4-y3)/(x4-x3);
      |  ^
main.c:10:1: error: lvalue required as unary '&' operand
   10 | &#160;&#160;&#160;&#160;sl2=(y4-y3)/(x4-x3);
      | ^
main.c:10:8: error: stray '#' in program
   10 | &#160;&#160;&#160;&#160;sl2=(y4-y3)/(x4-x3);
      |        ^
main.c:10:7: error: lvalue required as unary '&' operand
   10 | &#160;&#160;&#160;&#160;sl2=(y4-y3)/(x4-x3);
      |       ^
main.c:10:14: error: stray '#' in program
   10 | &#160;&#160;&#160;&#160;sl2=(y4-y3)/(x4-x3);
      |              ^
main.c:10:13: error: lvalue required as unary '&' operand
   10 | &#160;&#160;&#160;&#160;sl2=(y4-y3)/(x4-x3);
      |             ^
main.c:10:20: error: stray '#' in program
   10 | &#160;&#160;&#160;&#160;sl2=(y4-y3)/(x4-x3);
      |                    ^
main.c:10:19: error: lvalue required as unary '&' operand
   10 | &#160;&#160;&#160;&#160;sl2=(y4-y3)/(x4-x3);
      |                   ^
main.c:11:2: error: stray '#' in program
   11 | &#160;&#160;&#160;&#160;if (sl1==sl2){
      |  ^
main.c:11:1: error: lvalue required as unary '&' operand
   11 | &#160;&#160;&#160;&#160;if (sl1==sl2){
      | ^
main.c:11:8: error: stray '#' in program
   11 | &#160;&#160;&#160;&#160;if (sl1==sl2){
      |        ^
main.c:11:7: error: lvalue required as unary '&' operand
   11 | &#160;&#160;&#160;&#160;if (sl1==sl2){
      |       ^
main.c:11:14: error: stray '#' in program
   11 | &#160;&#160;&#160;&#160;if (sl1==sl2){
      |              ^
main.c:11:13: error: lvalue required as unary '&' operand
   11 | &#160;&#160;&#160;&#160;if (sl1==sl2){
      |             ^
main.c:11:20: error: stray '#' in program
   11 | &#160;&#160;&#160;&#160;if (sl1==sl2){
      |                    ^
main.c:11:19: error: lvalue required as unary '&' operand
   11 | &#160;&#160;&#160;&#160;if (sl1==sl2){
      |                   ^
main.c:12:2: error: stray '#' in program
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |  ^
main.c:12:1: error: lvalue required as unary '&' operand
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      | ^
main.c:12:8: error: stray '#' in program
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |        ^
main.c:12:7: error: lvalue required as unary '&' operand
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |       ^
main.c:12:14: error: stray '#' in program
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |              ^
main.c:12:13: error: lvalue required as unary '&' operand
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |             ^
main.c:12:20: error: stray '#' in program
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |                    ^
main.c:12:19: error: lvalue required as unary '&' operand
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |                   ^
main.c:12:26: error: stray '#' in program
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |                          ^
main.c:12:25: error: lvalue required as unary '&' operand
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |                         ^
main.c:12:32: error: stray '#' in program
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |                                ^
main.c:12:31: error: lvalue required as unary '&' operand
   12 | &#160;&#160;&#160;&#160;&#160;&#160;puts("YES");
      |                               ^
main.c:13:2: error: stray '#' in program
   13 | &#160;&#160;&#160;&#160;}else{
      |  ^
main.c:13:1: error: lvalue required as unary '&' operand
   13 | &#160;&#160;&#160;&#160;}else{
      | ^
main.c:13:8: error: stray '#' in program
   13 | &#160;&#160;&#160;&#160;}else{
      |        ^
main.c:13:7: error: lvalue required as unary '&' operand
   13 | &#160;&#160;&#160;&#160;}else{
      |       ^
main.c:13:14: error: stray '#' in program
   13 | &#160;&#160;&#160;&#160;}else{
      |              ^
main.c:13:13: error: lvalue required as unary '&' operand
   13 | &#160;&#160;&#160;&#160;}else{
      |             ^
main.c:13:20: error: stray '#' in program
   13 | &#160;&#160;&#160;&#160;}else{
      |                    ^
main.c:13:19: error: lvalue required as unary '&' operand
   13 | &#160;&#160;&#160;&#160;}else{
      |                   ^
main.c:14:2: error: stray '#' in program
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |  ^
main.c:14:1: error: lvalue required as unary '&' operand
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      | ^
main.c:14:8: error: stray '#' in program
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |        ^
main.c:14:7: error: lvalue required as unary '&' operand
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |       ^
main.c:14:14: error: stray '#' in program
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |              ^
main.c:14:13: error: lvalue required as unary '&' operand
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |             ^
main.c:14:20: error: stray '#' in program
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |                    ^
main.c:14:19: error: lvalue required as unary '&' operand
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |                   ^
main.c:14:26: error: stray '#' in program
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |                          ^
main.c:14:25: error: lvalue required as unary '&' operand
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |                         ^
main.c:14:32: error: stray '#' in program
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |                                ^
main.c:14:31: error: lvalue required as unary '&' operand
   14 | &#160;&#160;&#160;&#160;&#160;&#160;puts("NO");
      |                               ^
main.c:15:2: error: stray '#' in program
   15 | &#160;&#160;&#160;&#160;}
      |  ^
main.c:15:1: error: lvalue required as unary