c++学习10 -- 交换

#include <iostream>
using namespace std;

//利用引用是相同空间实现
void ExChange(int &a1 , int &b1)
{
    int nTemp = a1;
    a1 = b1;
    b1 = nTemp;
}

//不引用的话，新变量有自己的空间，不会交换数据。
void notExChange(int a1 , int b1)
{
    int nTemp = a1;
    a1 = b1;
    b1 = nTemp;
}

//用指针来实现
void ExChangeB(int *a1 , int *b1)
{
    int nTemp = *a1;
    *a1 = *b1;
    *b1 = nTemp;
}

int main()
{
    int a = 12, b = 15;

    cout << "a: " << a << endl;
    cout << "b: " << b << endl;

    //ExChange(a,b);
    //notExChange(a,b);
    ExChangeB(&a,&b);

    cout << "a: " << a << endl;
    cout << "b: " << b << endl;

    system("pause");
    return 0;
}