C++PrimerChap6传值，引用，传指针

#include<iostream> 
using namespace std;

//使用引用类型参数 
void swap(int &a,int &b)
{
    int temp = 0;
    temp = a;
    a = b;
    b = temp;
}
//传递指针就是传递地址 
void swapp(int *a,int *b)
{
    int temp = 0;
    temp = *a;
    *a = *b;
    *b = temp;
}

int main()
{
    int a = 1;
    int b = 2;
    cout<<a<<"  "<<b<<endl;
    swap(a,b);
    cout<<a<<"  "<<b<<endl;
    swapp(&a,&b);    
    cout<<a<<"  "<<b<<endl;
    return 0;
    
}
运行结果：
1 2
2 1
1 2