C++(引用三)

引用做函数参数

作用: 函数传参时,可以利用引用的技术让形参修饰实参

优点: 可以简化指针修改实参

示例:

#include <iostream>
using namespace std;

//1.值传递
void mySwap01(int a, int b) {
	int temp = a;
	a = b;
	b = temp;
}

//2. 地址传递
void mySwap02(int* a, int* b) {
	int temp = *a;
	*a = *b;
	*b = temp;
}

//3. 引用传递
void mySwap03(int& a, int& b) {
	int temp = a;
	a = b;
	b = temp;
}

int main(void)
{      
        int a = 10;
	int b = 20;

	mySwap01(a, b);
	cout << "a:" << a << " b:" << b << endl;

	mySwap02(&a, &b);
	cout << "a:" << a << " b:" << b << endl;

	mySwap03(a, b);
	cout << "a:" << a << " b:" << b << endl;

	system("pause");
      return 0;
}

总结:通过引用参数产生的效果同按地址传递是一样的。引用的语法更清楚简单

posted @ 2020-08-23 04:57  flyingswallow  阅读(95)  评论(0编辑  收藏  举报