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流淌的心,怎能阻拦,吹来的风,又怎能阻挡。

swap函数的一些扩展(数据结构)

Jacob posted @ Oct 23, 2017 07:35:49 PM in 未分类 with tags C语言 , 1079 阅读
#include <iostream>

using namespace std;
struct A{
    int a;
    int b;
}A1={0};
struct A my_swap(int a1,int b1)
{
    A1.a=b1;
    A1.b=a1;
    return A1;
}

int main()
{
    int a=1,b=2;
    A A2= my_swap(a,b);
    my_swap(a,b);
    printf("%d %d",a,b);
    return 0;
}

用结构体实现了swap

其实最简单的还是用指针来写swap

my_swap(int &a,int &b)
my_swap(int *a,int *b)
/×
两种写法等价

然而直接用

my_swap(int a,int b);
是不能交换函数值的

因为虽然在这个函数虽然在这个函数内部互换了函数值,但是这仅仅局限与函数内部,对于整个main函数的调用并没有使用返回值。

我在想如果用内联函数进行展开是不是可以交换呢。读者们可以亲自试试。
inline int swap(int a,int b);

 

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