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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。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | #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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