Print a reverse string using no loops in C

print_s_r.c

#include <stdio.h>

void print_s_r(const char * s) {
  if(*s != 0) {
    print_s_r(s+1);
    putchar(*s);
  }
}

int main() {
  print_s_r("Hello World!\n");
  return 0;
}