C++ 函数的引用传递

秒速五厘米 2023-02-22 13:55 180阅读 0赞

#include<iostream>
    #include<string>
    using namespace std;
    
    //1、值传递
    void mySwap01(int a, int b) {
    	int temp = a;
    	a = b;
    	b = temp;
    
    	cout << "mySwap01 a=" << a << endl;
    	cout << "mySwap01 b=" << b << endl;
    
    }
    
    //2、地址传递
    void mySwap02(int * a, int * b) {
    	int temp = *a;
    	*a = *b;
    	*b = temp;
    
    	cout << "mySwap01 a=" << *a << endl;
    	cout << "mySwap01 b=" << *b << endl;
    
    }
    
    //3、引用传递
    void mySwap03(int &a,int &b) {
    	int temp = a;
    	a = b;
    	b = temp;
    
    	cout << "mySwap03 a=" << a << endl;
    	cout << "mySwap03 b=" << b << endl;
    }
    
    int main() {
    
    	int a = 10;
    	int b = 20;
    	
    		mySwap01(a,b);  //值传递，形参不会修饰实参
    
    	//  mySwap02(&a, &b);
    
    	//  mySwap03(a, b);
    
    	cout << "a="<<a<<endl;
    	cout << "b="<<b<<endl;
    	system("pause" ) ;
    
    }

值传递实参不会改变

![20200704113932624.png][]

地址传递会改变实参的值

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l3bDQ3MDgxMjA4Nw_size_16_color_FFFFFF_t_70][]

引用传递

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l3bDQ3MDgxMjA4Nw_size_16_color_FFFFFF_t_70 1][]

[20200704113932624.png]: https://img-blog.csdnimg.cn/20200704113932624.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l3bDQ3MDgxMjA4Nw_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200704114257104.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l3bDQ3MDgxMjA4Nw==,size_16,color_FFFFFF,t_70