/in/foo.c: In function 'main':
/in/foo.c:6:12: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
  scanf("%d%d",&num1,num2);
            ^
/in/foo.c:6:2: warning: 'num2' is used uninitialized in this function [-Wuninitialized]
  scanf("%d%d",&num1,num2);
  ^~~~~~~~~~~~~~~~~~~~~~~~