/in/foo.c: In function 'main':
/in/foo.c:8:2: warning: statement with no effect [-Wunused-value]
  printf{"%d\n",sum);
  ^~~~~~
/in/foo.c:8:8: error: expected ';' before '{' token
  printf{"%d\n",sum);
        ^
/in/foo.c:6:6: warning: variable 'sum' set but not used [-Wunused-but-set-variable]
  int sum;
      ^~~