Language: C

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


Compiler output:
main.c:2:1: error: stray '\302' in program
    2 | <U+00A0>
      | ^~~~~~~~
main.c: In function 'main':
main.c:4:1: error: stray '\302' in program
    4 | <U+00A0>
      | ^~~~~~~~
main.c:5:1: error: stray '\302' in program
    5 | <U+00A0><U+00A0>int H , W ,i,j;
      | ^~~~~~~~
main.c:5:2: error: stray '\302' in program
    5 | <U+00A0><U+00A0>int H , W ,i,j;
      |         ^~~~~~~~
main.c:6:1: error: stray '\302' in program
    6 | <U+00A0>
      | ^~~~~~~~
main.c:7:1: error: stray '\302' in program
    7 | <U+00A0><U+00A0>while(1){
      | ^~~~~~~~
main.c:7:2: error: stray '\302' in program
    7 | <U+00A0><U+00A0>while(1){
      |         ^~~~~~~~
main.c:8:1: error: stray '\302' in program
    8 | <U+00A0><U+00A0><U+00A0><U+00A0>scanf("%d %d",&H, &W);
      | ^~~~~~~~
main.c:8:2: error: stray '\302' in program
    8 | <U+00A0><U+00A0><U+00A0><U+00A0>scanf("%d %d",&H, &W);
      |         ^~~~~~~~
main.c:8:3: error: stray '\302' in program
    8 | <U+00A0><U+00A0><U+00A0><U+00A0>scanf("%d %d",&H, &W);
      |                 ^~~~~~~~
main.c:8:4: error: stray '\302' in program
    8 | <U+00A0><U+00A0><U+00A0><U+00A0>scanf("%d %d",&H, &W);
      |                         ^~~~~~~~
main.c:9:1: error: stray '\302' in program
    9 | <U+00A0><U+00A0><U+00A0><U+00A0>if(H == 0 && W == 0) {
      | ^~~~~~~~
main.c:9:2: error: stray '\302' in program
    9 | <U+00A0><U+00A0><U+00A0><U+00A0>if(H == 0 && W == 0) {
      |         ^~~~~~~~
main.c:9:3: error: stray '\302' in program
    9 | <U+00A0><U+00A0><U+00A0><U+00A0>if(H == 0 && W == 0) {
      |                 ^~~~~~~~
main.c:9:4: error: stray '\302' in program
    9 | <U+00A0><U+00A0><U+00A0><U+00A0>if(H == 0 && W == 0) {
      |                         ^~~~~~~~
main.c:10:1: error: stray '\302' in program
   10 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>break;
      | ^~~~~~~~
main.c:10:2: error: stray '\302' in program
   10 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>break;
      |         ^~~~~~~~
main.c:10:3: error: stray '\302' in program
   10 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>break;
      |                 ^~~~~~~~
main.c:10:4: error: stray '\302' in program
   10 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>break;
      |                         ^~~~~~~~
main.c:10:5: error: stray '\302' in program
   10 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>break;
      |                                 ^~~~~~~~
main.c:10:6: error: stray '\302' in program
   10 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>break;
      |                                         ^~~~~~~~
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>
      | ^~~~~~~~
main.c:13:1: error: stray '\302' in program
   13 | <U+00A0>
      | ^~~~~~~~
main.c:14:1: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0>for(j=1; j<=H; j++) {
      | ^~~~~~~~
main.c:14:2: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0>for(j=1; j<=H; j++) {
      |         ^~~~~~~~
main.c:14:3: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0>for(j=1; j<=H; j++) {
      |                 ^~~~~~~~
main.c:14:4: error: stray '\302' in program
   14 | <U+00A0><U+00A0><U+00A0><U+00A0>for(j=1; j<=H; j++) {
      |                         ^~~~~~~~
main.c:15:1: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(i=1; i<=W; i++) {
      | ^~~~~~~~
main.c:15:2: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(i=1; i<=W; i++) {
      |         ^~~~~~~~
main.c:15:3: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(i=1; i<=W; i++) {
      |                 ^~~~~~~~
main.c:15:4: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(i=1; i<=W; i++) {
      |                         ^~~~~~~~
main.c:15:5: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(i=1; i<=W; i++) {
      |                                 ^~~~~~~~
main.c:15:6: error: stray '\302' in program
   15 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>for(i=1; i<=W; i++) {
      |                                         ^~~~~~~~
main.c:16:1: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0>if((i+j)%2 == 0 ) {
      | ^~~~~~~~
main.c:16:2: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0>if((i+j)%2 == 0 ) {
      |         ^~~~~~~~
main.c:16:3: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0>if((i+j)%2 == 0 ) {
      |                 ^~~~~~~~
main.c:16:4: error: stray '\302' in program
   16 | <U+00A0><U+00A0><U+00A0><U+00A0>if((i+j)%2 == 0 ) {
      |                         ^~~~~~~~
main.c:17:1: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("#");
      | ^~~~~~~~
main.c:17:2: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("#");
      |         ^~~~~~~~
main.c:17:3: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("#");
      |                 ^~~~~~~~
main.c:17:4: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("#");
      |                         ^~~~~~~~
main.c:17:5: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("#");
      |                                 ^~~~~~~~
main.c:17:6: error: stray '\302' in program
   17 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("#");
      |                                         ^~~~~~~~
main.c:18:1: error: stray '\302' in program
   18 | <U+00A0><U+00A0><U+00A0><U+00A0>} else<U+00A0> {
      | ^~~~~~~~
main.c:18:2: error: stray '\302' in program
   18 | <U+00A0><U+00A0><U+00A0><U+00A0>} else<U+00A0> {
      |         ^~~~~~~~
main.c:18:3: error: stray '\302' in program
   18 | <U+00A0><U+00A0><U+00A0><U+00A0>} else<U+00A0> {
      |                 ^~~~~~~~
main.c:18:4: error: stray '\302' in program
   18 | <U+00A0><U+00A0><U+00A0><U+00A0>} else<U+00A0> {
      |                         ^~~~~~~~
main.c:18:11: error: stray '\302' in program
   18 | <U+00A0><U+00A0><U+00A0><U+00A0>} else<U+00A0> {
      |                                       ^~~~~~~~
main.c:19:1: error: stray '\302' in program
   19 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf(".");
      | ^~~~~~~~
main.c:19:2: error: stray '\302' in program
   19 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf(".");
      |         ^~~~~~~~
main.c:19:3: error: stray '\302' in program
   19 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf(".");
      |                 ^~~~~~~~
main.c:19:4: error: stray '\302' in program
   19 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf(".");
      |                         ^~~~~~~~
main.c:19:5: error: stray '\302' in program
   19 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf(".");
      |                                 ^~~~~~~~
main.c:19:6: error: stray '\302' in program
   19 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf(".");
      |                                         ^~~~~~~~
main.c:20:1: error: stray '\302' in program
   20 | <U+00A0><U+00A0><U+00A0><U+00A0>}
      | ^~~~~~~~
main.c:20:2: error: stray '\302' in program
   20 | <U+00A0><U+00A0><U+00A0><U+00A0>}
      |         ^~~~~~~~
main.c:20:3: error: stray '\302' in program
   20 | <U+00A0><U+00A0><U+00A0><U+00A0>}
      |                 ^~~~~~~~
main.c:20:4: error: stray '\302' in program
   20 | <U+00A0><U+00A0><U+00A0><U+00A0>}
      |                         ^~~~~~~~
main.c:21:1: error: stray '\302' in program
   21 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>}
      | ^~~~~~~~
main.c:21:2: error: stray '\302' in program
   21 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>}
      |         ^~~~~~~~
main.c:21:3: error: stray '\302' in program
   21 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>}
      |                 ^~~~~~~~
main.c:21:4: error: stray '\302' in program
   21 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>}
      |                         ^~~~~~~~
main.c:21:5: error: stray '\302' in program
   21 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>}
      |                                 ^~~~~~~~
main.c:21:6: error: stray '\302' in program
   21 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>}
      |                                         ^~~~~~~~
main.c:22:1: error: stray '\302' in program
   22 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("\n");<U+00A0>
      | ^~~~~~~~
main.c:22:2: error: stray '\302' in program
   22 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("\n");<U+00A0>
      |         ^~~~~~~~
main.c:22:3: error: stray '\302' in program
   22 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("\n");<U+00A0>
      |                 ^~~~~~~~
main.c:22:4: error: stray '\302' in program
   22 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("\n");<U+00A0>
      |                         ^~~~~~~~
main.c:22:5: error: stray '\302' in program
   22 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("\n");<U+00A0>
      |                                 ^~~~~~~~
main.c:22:6: error: stray '\302' in program
   22 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("\n");<U+00A0>
      |                                         ^~~~~~~~
main.c:22:20: error: stray '\302' in program
   22 | <U+00A0><U+00A0><U+00A0><U+00A0><U+00A0><U+00A0>printf("\n");<U+00A0>
      |                                                              ^~~~~~~~
main.c:23:1: error: stray '\302' in program
   23 | <U+00A0><U+00A