/in/foo.c: In function 'main':
/in/foo.c:7:2: warning: statement with no effect [-Wunused-value]
  printf{"%d\n",sum);
  ^~~~~~
/in/foo.c:7:8: error: expected ';' before '{' token
  printf{"%d\n",sum);
        ^
/in/foo.c:4:10: warning: variable 'sum' set but not used [-Wunused-but-set-variable]
  int x,y,sum;
          ^~~