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getTotalWeight()，计算二者的重量和。
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#include<iostream>
using
namespace
std;
class
Car;
class
Boat{
public
:
Boat(
int
Weight){
weight1=Weight;
}
friend
int
getTotalWeight(Boat p1,Car p2);
private
:
int
weight1;
};
class
Car{
public
:
Car(
int
Weight){
weight2=Weight;
}
friend
int
getTotalWeight(Boat p1,Car p2){
return
p1.weight1+p2.weight2;
}
private
:
int
weight2;
};
int
main(){
Boat myboat(100);
Car mycar(200);
cout<<
"The total weight is "
<<getTotalWeight(myboat,mycar)<<endl;
return
0;
}
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本文转自 pangfc 51CTO博客，原文链接：http://blog.51cto.com/983836259/1338333，如需转载请自行联系原作者
