自定义函数求字符串长度

#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>

int my_strlen(char* st)

{

int count = 0;

while (*st != '\0')

{

 count++;

 *st++;

}

return count;

}

int main()

{

char arr[] = "bit";

int len = my_strlen(arr);

printf("%d\n", len);

return 0;

}