Write a Program to swap two numbers.

#include<iostream>
using namespace std;
int main()
{
int num1,num2,temp;
cout<<"Enter 1st number: ";
cin>>num1;
cout<<"Enter 2nd number: ";
cin>>num2;
temp=num1;
num1=num2;
num2=temp;
cout<<"1st number is : "<<num1<<endl;
cout<<"2nd number is : "<<num2;
}