/in/foo.c: In function 'main':
/in/foo.c:5:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
   scanf("%d%d",&a);
             ^
/in/foo.c:7:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
   scanf("%d%d",&b);
             ^