递归和非递归分别实现strlen

递归

[code]#include<stdio.h>
#include<windows.h>
int my_strlen(char *string)
{
int count = 0;
if (*string != '\0')
{
string++;
count = 1 + my_strlen(string);
}
return count;
}

int main()
{
char *str = "abcdef";
printf("%d\n",my_strlen(str));
system("pause");
return 0;
}

非递归

[code]#include<stdio.h>
#include<windows.h>
int my_strlen(char *string)
{
int count = 0;
while(*string++ != '\0')
{
count++;
}
return count;
}

int main()
{
char *str = "abcdef";
printf("%d\n",my_strlen(str));
system("pause");
return 0;
}