/in/foo.c: In function 'main':
/in/foo.c:6:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf("%d %d",a,b);
          ^
/in/foo.c:6:13: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
  scanf("%d %d",a,b);
             ^
/in/foo.c:6:2: warning: 'a' is used uninitialized in this function [-Wuninitialized]
  scanf("%d %d",a,b);
  ^~~~~~~~~~~~~~~~~~
/in/foo.c:6:2: warning: 'b' is used uninitialized in this function [-Wuninitialized]