/in/foo.c: In function 'main':
/in/foo.c:7:16: warning: format '%d' expects a matching 'int' argument [-Wformat=]
    7 |      {printf("%d is not a primer!");
      |               ~^
      |                |
      |                int
/in/foo.c:9:15: warning: format '%d' expects a matching 'int' argument [-Wformat=]
    9 |      printf("%d is a primer!");
      |              ~^
      |               |
      |               int