#include <iostream>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
//C++ P186 5-14
/*定义Boat与Car两个类,二者都有weight属性,定义两者的一个友元函数
getTatalWweigth(),计算两者的重量和*/
class Boat{
public:
Boat(int weight=0):weight(weight){} //构造函数
friend float getTotalWeight(Boat &b,Car &c); //友元函数
private:
float weight;
};
class Car{
public:
Car(int weight=0):weight(weight){} //构造函数
friend float getTotalWeight(Boat &b,Car &c); //友元函数
private:
float weight;
};
float getTotalWeight(Boat &b,Car &c)
{
return (b.weight+c.weight);
}
int main(int argc, char** argv) {
Boat b(10);
Car c(20);
cout<<"Total Weight=";
cout<<getTotalWeight(b,c)<<endl;
return 0;
}
这怎么搞?将类的定义放在另一个头文件吗?
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- 小学狗喵喵叫 2020-04-03 11:07关注
class Car; class Boat { public: Boat(int weight = 0) :weight(weight) {} //构造函数 friend float getTotalWeight(Boat& b, Car& c); //友元函数 private: float weight; }; class Car { public: Car(int weight = 0) :weight(weight) {} //构造函数 friend float getTotalWeight(Boat& b, Car& c); //友元函数 private: float weight; }; float getTotalWeight(Boat& b, Car& c);
#include "....h" float getTotalWeight(Boat& b, Car& c) { return (b.weight + c.weight); }
#include "....h" #include <iostream> using namespace std; int main(int argc, char** argv) { Boat b(10); Car c(20); cout<<"Total Weight="; cout<<getTotalWeight(b,c)<<endl; return 0; }
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