C语言字符串逆序 C语言递归实现字符串逆序的方式详解

'//字符串逆序：不可用字符串操作函数'
#include <stdio.h>
void swap(char* ch1, char* ch2)             '//交换两个字符串'
{
	char tmp = *ch1;
	*ch1 = *ch2;
	*ch2 = tmp;
}
int my_strlen(char* str)                     '//实现计算字符串字节数'
{
	int count = 0;
	while (*str != '\0')
	{
		count++;
		str++;
	}
	return count;
}
void reverse_string(char* str)                '//实现字符串逆序'
{
	int left = 0;
	int right = my_strlen(str) - 1;
	while (left < right)
	{
		swap(str+left, str+right);
		left++;
		right--;
	}
}
int main() {
	char arr[] = "abcdefgh";
	reverse_string(arr);
	printf("%s\n", arr);
	return 0;
}

//递归实现字符串逆序
void reverse_string(char* str)
{
	if (*str != '\0')
	{
		char tmp = *str;
		int length = strlen(str);
		*str = *(str+ length - 1);
		*(str + length - 1) = '\0';
		reverse_string(str + 1);
		*(str + length - 1) = tmp;
	}
	
}
int main()
{
	char arr[] = "abcdefgh";
	reverse_string(arr);
	printf("%s\n", arr);
	return 0;
}