Language: C

#include<stdio.h>
int main()
{
  int a,b,i,j;
  while(1)
       {
  scanf("%d%d",&a,&b);
  if(a==0&&b==0){break;}
 
  for(i=1;i<=a;i++)
    {
      for(j=1;j<=b;j++)
    {
      if(j%2==1)
        {
          if(i%2==1)printf("#");
          else printf(".");
        }
      else
        {
              if(i%2==1)printf(".");
          else printf("#");
        }
    }
      printf("\n");
    }
  printf("\n");
     
       }
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:4:1: error: stray '\302' in program
    4 | <U+00A0><U+00A0>int a,b,i,j;
      | ^~~~~~~~
main.c:4:2: error: stray '\302' in program
    4 | <U+00A0><U+00A0>int a,b,i,j;
      |         ^~~~~~~~
main.c:5:1: error: stray '\302' in program
    5 | <U+00A0><U+00A0>while(1)
      | ^~~~~~~~
main.c:5:2: error: stray '\302' in program
    5 | <U+00A0><U+00A0>while(1)
      |         ^~~~~~~~
main.c:6:1: error: stray '\302' in program
    6 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      | ^~~~~~~~
main.c:6:2: error: stray '\302' in program
    6 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |         ^~~~~~~~
main.c:6:3: error: stray '\302' in program
    6 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                 ^~~~~~~~
main.c:6:4: error: stray '\302' in program
    6 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                         ^~~~~~~~
main.c:6:5: error: stray '\302' in program
    6 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                                 ^~~~~~~~
main.c:6:6: error: stray '\302' in program
    6 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                                         ^~~~~~~~
main.c:6:7: error: stray '\302' in program
    6 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                                                 ^~~~~~~~
main.c:7:1: error: stray '\302' in program
    7 | <U+00A0><U+00A0>scanf("%d%d",&a,&b);
      | ^~~~~~~~
main.c:7:2: error: stray '\302' in program
    7 | <U+00A0><U+00A0>scanf("%d%d",&a,&b);
      |         ^~~~~~~~
main.c:8:1: error: stray '\302' in program
    8 | <U+00A0><U+00A0>if(a==0&&b==0){break;}
      | ^~~~~~~~
main.c:8:2: error: stray '\302' in program
    8 | <U+00A0><U+00A0>if(a==0&&b==0){break;}
      |         ^~~~~~~~
main.c:9:1: error: stray '\302' in program
    9 | <U+00A0>
      | ^~~~~~~~
main.c:10:1: error: stray '\302' in program
   10 | <U+00A0><U+00A0>for(i=1;i<=a;i++)
      | ^~~~~~~~
main.c:10:2: error: stray '\302' in program
   10 | <U+00A0><U+00A0>for(i=1;i<=a;i++)
      |         ^~~~~~~~
main.c:11:1: error: stray '\302' in program
   11 | <U+00A0><U+00A0><U+00A0><U+00A0>{
      | ^~~~~~~~
main.c:11:2: error: stray '\302' in program
   11 | <U+00A0><U+00A0><U+00A0><U+00A0>{
      |         ^~~~~~~~
main.c:11:3: error: stray '\302' in program
   11 | <U+00A0><U+00A0><U+00A0><U+00A0>{
      |                 ^~~~~~~~
main.c:11:4: error: stray '\302' in program
   11 | <U+00A0><U+00A0><U+00A0><U+00A0>{
      |                         ^~~~~~~~
main.c:12:1: error: stray '\302' in program
   12 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(j=1;j<=b;j++)
      | ^~~~~~~~
main.c:12:2: error: stray '\302' in program
   12 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(j=1;j<=b;j++)
      |         ^~~~~~~~
main.c:12:3: error: stray '\302' in program
   12 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(j=1;j<=b;j++)
      |                 ^~~~~~~~
main.c:12:4: error: stray '\302' in program
   12 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(j=1;j<=b;j++)
      |                         ^~~~~~~~
main.c:12:5: error: stray '\302' in program
   12 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(j=1;j<=b;j++)
      |                                 ^~~~~~~~
main.c:12:6: error: stray '\302' in program
   12 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(j=1;j<=b;j++)
      |                                         ^~~~~~~~
main.c:13:1: error: stray '\302' in program
   13 | <U+00A0><U+00A0><U+00A0><U+00A0>{
      | ^~~~~~~~
main.c:13:2: error: stray '\302' in program
   13 | <U+00A0><U+00A0><U+00A0><U+00A0>{
      |         ^~~~~~~~
main.c:13:3: error: stray '\302' in program
   13 | <U+00A0><U+00A0><U+00A0><U+00A0>{
      |                 ^~~~~~~~
main.c:13:4: error: stray '\302' in program
   13 | <U+00A0><U+00A0><U+00A0><U+00A0>{
      |                         ^~~~~~~~
main.c:14:1: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(j%2==1)
      | ^~~~~~~~
main.c:14:2: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(j%2==1)
      |         ^~~~~~~~
main.c:14:3: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(j%2==1)
      |                 ^~~~~~~~
main.c:14:4: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(j%2==1)
      |                         ^~~~~~~~
main.c:14:5: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(j%2==1)
      |                                 ^~~~~~~~
main.c:14:6: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(j%2==1)
      |                                         ^~~~~~~~
main.c:15:1: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      | ^~~~~~~~
main.c:15:2: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |         ^~~~~~~~
main.c:15:3: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                 ^~~~~~~~
main.c:15:4: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                         ^~~~~~~~
main.c:15:5: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                                 ^~~~~~~~
main.c:15:6: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                                         ^~~~~~~~
main.c:15:7: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                                                 ^~~~~~~~
main.c:15:8: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>{
      |                                                         ^~~~~~~~
main.c:16:1: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      | ^~~~~~~~
main.c:16:2: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      |         ^~~~~~~~
main.c:16:3: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      |                 ^~~~~~~~
main.c:16:4: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      |                         ^~~~~~~~
main.c:16:5: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      |                                 ^~~~~~~~
main.c:16:6: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      |                                         ^~~~~~~~
main.c:16:7: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      |                                                 ^~~~~~~~
main.c:16:8: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      |                                                         ^~~~~~~~
main.c:16:9: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      |                                                                 ^~~~~~~~
main.c:16:10: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>if(i%2==1)printf("#");
      |                                                                         ^~~~~~~~
main.c:17:1: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>else printf(".");
      | ^~~~~~~~
main.c:17:2: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>else printf(".");
      |         ^~~~~~~~
main.c:17:3: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>else printf(".");
      |                 ^~~~~~~~
main.c:17:4: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>else printf(".");
      |                         ^~~~~~~~
main.c:17:5: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>else printf(".");
      |                                 ^~~~~~~~
main.c:17:6: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>else printf(".");
      |                                         ^~~~~~~~
main.c:17:7: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>else printf(".");
      |                                                 ^~~~~~~~
main.c:17:8: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>else printf(".");
      |                                                         ^~~~~~~~
main.c:17:9: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>else printf(".");
      |                                                                 ^~~~~~~~
main.c:17:10: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00