/in/foo.c: In function 'main':
/in/foo.c:12:11: warning: format '%ld' expects argument of type 'long int *', but argument 2 has type 'long double *' [-Wformat=]
  scanf("%ld %ld",&a,&b);
           ^
/in/foo.c:12:15: warning: format '%ld' expects argument of type 'long int *', but argument 3 has type 'long double *' [-Wformat=]
  scanf("%ld %ld",&a,&b);
               ^
/in/foo.c:14:12: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'long double' [-Wformat=]
  printf("%ld",c);
            ^