实现两个数的互换算法小结

以下代码通过传递指针，交换两个变量的内容：

void swap(int* m, int* n)
{

    int c;
    c = *m;
    *m = *n;
    *n = c;

}

int main()
{
    int m = 5 , n = 4;
    swap(&m, &n);
    printf("m = %d, n = %d
", m, n);
}

以下代码通过传递引用，交换两个变量的值：

#include<stdio.h>
#include "stdafx.h"

void swap(int &m, int &n)
{

    int c;
    c = m;
    m = n;
    n = c;

}

int main()
{
    int m = 5 , n = 4;
    swap(m, n);
    printf("m = %d, n = %d
", m, n);
}

  通过不开辟额外的内存空间来实现，元素的交换

#include<stdio.h>
#include "stdafx.h"


int main()
{
    int m = 5 , n = 4;
    m = n - m;
    n = n - m;
    m = m + n;
    
    printf("m = %d, n = %d
", m, n);
    return 0;
}