所谓值传递,就是函数调用时实参将数值传入给形参
值传递时,如果形参发生改变,并不会影响形参
#include<iostream>
using namespace std;
//值传递
//定义函数,实现两个数字进行交换函数
//如果函数不需要返回值,声明的时候可以写void
void swap(int num1 ,int num2)
{
cout << "交换前:" << endl;
cout << "num1 = " << num1 <<endl;
cout << "num2 = " << num2 << endl;
int temp = num1
num1 = num2;
num2 = temp;
cout << "交换后:" << endl;
cout << "num1 = " << num1 <<endl;
cout << "num2 = " << num2 << endl;
return; //返回值不需要的时候,可以不写return
}
int main() {
int a = 10;
int b = 20;
cout << "a = " << a << endl;
cout << "b = " << b << endl;
//函数的形参发生改变,并不会影响实参
swap(a, b); //相当于把a给了num 1 把b给了num2;
system("pause");
return 0;
}