4.6－指针传递.cpp

Visual C++的课件

//Listing 9.6 Demonstrates passing by reference

#include <iostream.h>

void swap(int *x, int *y);

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

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

void swap (int *px, int *py)
{
	int temp;

	cout << "Swap. Before swap, *px: " << *px << " *py: " << *py << "\n";

	temp = *px;
	*px = *py;
	*py = temp;

	cout << "Swap. After swap, *px: " << *px << " *py: " << *py << "\n";

}