【C语言】变量数据交换方法

通过不同的方法对变量进行数据交换，下面是4种方法：

前三种的共同有点是他们要比第四种节省空间，比如在嵌入式中内存比较小，会用到前3种方法

在前三种方法中前两种又容易产生溢出，所以都数据有范围要求

第三种用到的是位运算种的异或，先将两个数相互异或，再进行一次异或即可还原，注意还原时候的顺序

#include<stdio.h>void method_1(int x, int y);void method_2(int x, int y);void method_3(int x, int y);void method_3(int x, int y);void main(){    int a, b , z;    printf("请输入两个整数：");    scanf("%d%d",&a,&b);    method_1(a, b);    method_2(a, b);    method_3(a, b);    method_4(a, b);}void method_1(int x, int y){    printf("没有交换：x=%d,y=%d\n", x, y);    x = x + y;    y = x - y;    x = x - y;    printf("交换：x=%d,y=%d\n", x, y);}void method_2(int x,int y){    printf("没有交换：x=%d,y=%d\n", x, y);    x = x * y;    y = x / y;    x = x / y;    printf("交换：x=%d,y=%d\n", x, y);}void method_3(int x, int y){    printf("没有交换：x=%d,y=%d\n", x, y);    x = x ^ y;    y = x ^ y;    x = x ^ y;    printf("交换：x=%d,y=%d\n", x, y);}void method_4(int x, int y){    printf("没有交换：x=%d,y=%d\n", x, y);    int z;    z = x;    x = y;    y = z;    printf("交换：x=%d,y=%d\n", x, y);}