交换两个数字

#include<iostream>using namespace std;void swap1(double d1,double d2){double temp;temp=d1;d1=d2;d2=temp;}void swap2(double &d1,double &d2){double temp;temp=d1;d1=d2;d2=temp;}void swap3(double *d1,double *d2){double temp;temp=*d1;*d1=*d2;*d2=temp;}int main(){double x,y;cout<<"输入x和y："<<'\n';cin>>x>>y;swap3(&x,&y);cout<<x<<'\t'<<y<<endl;return 0;}