l4_4.cpp

《C++程序设计教程》电子教案及例题源码

#include <iostream.h>
void main()
{
    int a=1;
    int c=10;
    int &b = a;
    cout << a << ", " << b <<", " << c << endl;
	b = c;
    cout << a << ", " << b <<", " << c << endl;
	b=20;
    cout << a << ", " << b <<", " << c << endl;
}