C++关于引用的小知识

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#include <iostream>using namespace std;void fun1(int b){b = 1;}void fun2(int &b){b = 2;}void fun3(int *b){*b = 3;}void main(){int a = 0;fun1(a);cout << "调用fun1后，a的值为：" << a << endl;fun2(a);cout << "调用fun2后，a的值为：" << a << endl;fun3(&a);cout << "调用fun3后，a的值为：" << a << endl;}

下面3个不同的方法来加注理解

 void swap1(int &a,int &b) { int t; t = a; a = b; b = t; } int main(){int x = 5;int y = 10;cout << x << " " << y << endl;swap1(x, y);cout << x << " " << y << endl;//  结果是10，5return 0;}

 void swap1(int a,int b) { int t; t = a; a = b; b = t; } int main(){int x = 5;int y = 10;cout << x << " " << y << endl;swap1(x, y);cout << x << " " << y << endl;// 结果是5，10，不是 引用，x和y的值压根就没有变化return 0;}

 void swap1(int &a,int b) { int t; t = a; a = b; b = t; } int main(){int x = 5;int y = 10;cout << x << " " << y << endl;swap1(x, y);cout << x << " " << y << endl;// 10，10return 0;}

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