foo.c: In function 'main':
foo.c:7:13: warning: passing argument 1 of 'printf' makes pointer from integer without a cast [-Wint-conversion]
    7 |     printf(n-1);
      |            ~^~
      |             |
      |             int
In file included from foo.c:1:
/nix/store/3w4yrspgcx1z9wi18rv0hbap4jjlhx4c-glibc-2.37-8-dev/include/stdio.h:356:43: note: expected 'const char * restrict' but argument is of type 'int'
  356 | extern int printf (const char *__restrict __format, ...);
      |                    ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~

[Hydro](https://hydro.ac)提供评测服务