/in/foo.c: In function 'main':
/in/foo.c:6:16: warning: zero-length gnu_printf format string [-Wformat-zero-length]
    6 |         printf("",n);
      |                ^~
/in/foo.c:7:19: error: invalid operands to binary & (have 'char *' and 'int')
    7 |         scanf("%d"&n);
      |               ~~~~^
      |               |
      |               char *