swap

代码#include <iostream>
using namespace std;
void swap(int *i,int *j)
{
    int temp = *i;
    *i = *j;
    *j = temp;

}
void swap2(int &i,int &j)
{
    int temp = i;
    i = j;
    j = temp;
}
int main()
{
    int a = 10,b = 20;
    swap(a,b);
    cout<<a<<" "<<b<<endl;
    swap2(a,b);
    cout<<a<<" "<<b<<endl;
    return 0;

}