/in/foo.c: In function 'main':
/in/foo.c:14:12: warning: format '%d' expects a matching 'int' argument [-Wformat=]
   printf("%d is a primer!");
            ^
/in/foo.c:16:12: warning: format '%d' expects a matching 'int' argument [-Wformat=]
   printf("%d is not a primer!");
            ^