/in/foo.c: In function 'main':
/in/foo.c:17:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   17 |                 if(j=!0)printf("")
      |                    ^
/in/foo.c:17:32: warning: zero-length gnu_printf format string [-Wformat-zero-length]
   17 |                 if(j=!0)printf("")
      |                                ^~
/in/foo.c:17:35: error: expected ';' before 'printf'
   17 |                 if(j=!0)printf("")
      |                                   ^
      |                                   ;
   18 |                         printf("%d",arr[j]);
      |                         ~~~~~~     
/in/foo.c:6:13: warning: variable 'arr' set but not used [-Wunused-but-set-variable]
    6 |         int arr[1005],len=0;
      |             ^~~