C++编制一个程序,可分别用指针参数和引用参数实现两个数的交换，求这两个数从键盘输入，并将交换前后的结

Question

C++编制一个程序，可分别用指针参数和引用参数实现两个数的交换，要求这两个数从键盘输入，并将交换前后的结果输出作比较

Answer 1

#include<iostream>
#include<cstdlib>

using namespace std;

void swap(float *p,float *q)
{
float t=*p;
*p=*q;
*q=t;
}
void swap2(float &p,float &q)
{
float t=p;
p=q;
q=t;
}
int main(int argc,char* argv[])
{
float a,b;

cout<<"请输入两个数：";
cin>>a>>b;
cout<<"交换前：";
cout<<a<<" "<<b<<endl;
swap(&a,&b);
cout<<"交换后：";
cout<<a<<" "<<b<<endl;

cout<<"请输入两个数：";
cin>>a>>b;
cout<<"交换前：";
cout<<a<<" "<<b<<endl;
swap2(a,b);
cout<<"交换后：";
cout<<a<<" "<<b<<endl;

system("PAUSE");
return EXIT_SUCCESS;
}