递归和非递归分别实现strlen

递归和非递归分别实现strlen

递归
#include<stdio.h>
int mystrlen(char* string)
{
	if (*string != '\0')
	{
		return 1 + mystrlen(string + 1);
	}
	else
	{
		return 0;
	}
}
int main()
{
	char string[30] = {0};
	printf("请输入需要计算的字符串:>");
	scanf("%s", string);
	int ret = mystrlen(string);
	printf("%d\n", ret);
	return 0;
}

非递归
#include<stdio.h>
int mystrlen(char* string)
{
	int count = 0;
	while (*string != '\0')
	{
		count++;
		string++;
	}
	return count;
}
int main()
{
	char string[30] = { 0 };
	printf("请输入需要计算的字符串:>");
	scanf("%s", string);
	int ret = mystrlen(string);
	printf("%d\n", ret);
	return 0;
}