5-14

定义 Boat与Car 两个类，二者都有weight属性,定义二者的一个友元函数getTotal Weight(),计算二者的重量和。

 1 #include <iostream>
 2 #include <string>
 3 #include <stdio.h>
 4 using namespace std;
 5 class Car;
 6 class Boat{
 7 private:
 8     int weight;
 9 public:
10     friend void getTotalWeight(Boat&, Car&);
11     Boat(){weight = 0;}
12     Boat(int w){weight = w;}
13     ~Boat(){}
14 };
15 
16 class Car{
17 private:
18     int weight;
19 public:
20     friend void getTotalWeight(Boat&, Car&);
21     Car(){weight = 0;}
22     Car(int w){weight = w;}
23     ~Car(){}
24 };
25 
26 void getTotalWeight(Boat &b, Car &c){
27     cout<<"Totalweight:"<<b.weight+c.weight;
28     
29 }
30 int main(){
31     Boat b(100);
32     Car c(200);
33     getTotalWeight(b, c);
34     return 0;
35     
36 }

 

posted @ 2023-03-14 22:25  nlkdfgnvfdkl  阅读(55)  评论(0)    收藏  举报