Swapping two integers

#include<iostream>
using namespace std;
void main()
{
 int a;
 int b;
 int c;
 cout << "Enter the first number :" << endl;
 cin >> a;
 cout << "Enter the second number :" << endl;
 cin >> b;
 c = a;
 a = b;
 b = c;
 cout << "The new value of a is " << a << endl;
 cout << "The new value of the b is " << b << endl;
 system("pause");

}