strlen的三种实现方式

标签：strlen 三种 数组 指针 递归

#include <stdio.h>

#include <stdlib.h>

//实现strlen

int my_strlen1(char str[])//数组

{

                 int count = 0;

                 int i = 0;

                 while (str [i] != ‘\0‘)

                {

                                count++;

                                i++;

                }

                 return count;

}

int my_strlen2(char *str)//指针

{

                 int i = 0;

                 while (*str )

                {

                                i++;

                                 str++;

                }

                 return i;

}

int my_strlen3(char *str)//递归

{

                 int i = 0;

                 if (*str == ‘\0‘)

                {

                                 return 1;

                }

                 return 1 + my_strlen3(str + 1);

}

int main()

{

                 char str[] = "abcdef" ;

                 int ret = my_strlen1(str);

                printf( "%s的长度为%d\n" , str, ret);

                 int ret2 = my_strlen2(str);

                printf( "%s的长度为%d\n" , str, ret2);

                 int ret3 = my_strlen3(str);

                printf( "%s的长度为%d\n" , str, ret3);

                system( "pause");

                 return 0;

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strlen的三种实现方式

标签：strlen 三种 数组 指针 递归

原文地址：http://10626786.blog.51cto.com/10616786/1693360