4elist0505.cpp

《21天学通C＋＋》附盘的原代码。书上的每个例子在这里都有相应的C语言程序。

// Listing 5.5 - demonstrates passing by value

#include <iostream>

void swap(int x, int y);

int main()
{
	int x = 5, y = 10;

	std::cout << "Main. Before swap, x: " << x << " y: " << y << "\n";
	swap(x,y);
	std::cout << "Main. After swap, x: " << x << " y: " << y << "\n";
	return 0;
}

void swap (int x, int y)
{
	int temp;

	std::cout << "Swap. Before swap, x: " << x << " y: " << y << "\n";

	temp = x;
	x = y;
	y = temp;

	std::cout << "Swap. After swap, x: " << x << " y: " << y << "\n";
}