#include<stdio.h>
int my_strlen(char*str)
{
  if (*str != '\0')
    return 1 + my_strlen(str + 1);
  else
    return 0;
}

int main()
{
  int ret = 0;
  char arr[] = "hi bit";
  ret = my_strlen(arr);
  printf("字符串长度为%d", ret);
  return 0;
}