/in/foo.c: In function 'main':
/in/foo.c:5:9: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
 scanf("%d",a);
         ^
/in/foo.c:6:9: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
 scanf("%d",b);
         ^
/in/foo.c:5:1: warning: 'a' is used uninitialized in this function [-Wuninitialized]
 scanf("%d",a);
 ^~~~~~~~~~~~~
/in/foo.c:6:1: warning: 'b' is used uninitialized in this function [-Wuninitialized]
 scanf("%d",b);
 ^~~~~~~~~~~~~