/in/foo.c: In function 'main':
/in/foo.c:7:9: warning: zero-length gnu_printf format string [-Wformat-zero-length]
  printf("");
         ^~
/in/foo.c:14:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(a%b==0&&d%b==0&&e%b==0&&f%b==0)
   ^~
/in/foo.c:16:18: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
                  break;
                  ^~~~~