ch4-3.cpp

c++编写的关于课程管理系统的软件

#include <iostream.h>
//1.按值递

//void swap(int x, int y);   //函数声明

//2.按地址传
void swap(int *x, int *y);   //函数声明

//2.按地址传
void swap(int &x, int &y);   //函数声明

void main()
{

   int a, b;
   a = 10;
   b = 20;
   cout<<"按数值传:"<<endl;
   swap(a, b);
   cout << a << ", " << b << endl;
   
   cout<<"按地址传:"<<endl;
   swap(&a, &b);
   cout << a << ", " << b << endl;

   cout<<"按引用传:"<<endl;
   swap(a, b);
   cout << a << ", " << b << endl;

}
//按值 
/*void swap(int x, int y)
 {
   int temp;
   temp = x;
   x = y;
   y = temp;
}
*/
//地址
void swap(int *x, int *y)
{
   int temp;
   temp = *x;
   *x = *y;
   *y = temp;
}
//引用
 void swap(int &x, int &y)
 {
   int temp;
   temp = x;
   x = y;
   y = temp;
}