list0905.cpp

teach yourself C++ in 21 days 第五版

//Listing 9.5 - Demonstrates passing by value
#include <iostream>
  
using namespace std;
void swap(int x, int y);
  
int main()
{
    int x = 5, y = 10;
  
    cout << "Main. Before swap, x: " << x << " y: " << y << endl;
    swap(x,y);
    cout << "Main. After swap, x: " << x << " y: " << y << endl;
    return 0;
}
  
void swap (int x, int y)
{
    int temp;
  
    cout << "Swap. Before swap, x: " << x << " y: " << y << endl;
  
    temp = x;
    x = y;
    y = temp;
  
    cout << "Swap. After swap, x: " << x << " y: " << y << endl;
}