86 lines
1.6 KiB
C++
86 lines
1.6 KiB
C++
#include <iostream>
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using namespace std;
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class CallBackObject;
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class Server
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{
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public:
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Server(int size) :len(size)
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{
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data = new int [len];//1
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for (int i = 0;i < len;++i)
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data[i] = i + 1;
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}
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~Server() { delete[] data; }//2
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int Total(CallBackObject& obj);
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private:
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int len;
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int* data;
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};
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class CallBackObject
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{
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public:
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virtual ~CallBackObject() {}
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virtual int CallBackFunc(int val) = 0;//4
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};
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class ClientA :public CallBackObject
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{
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public:
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virtual ~ClientA() {}
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virtual int CallBackFunc(int val)
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{
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return val;
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}
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void RequestA(Server& srv)
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{
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cout << srv.Total(*this) << endl;//5
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}
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};
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int Server::Total(CallBackObject& obj)
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{
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int sum = 0;
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for (int i = 0; i < len; ++i) {
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sum += obj.CallBackFunc(data[i]);//3
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}
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return sum;
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}
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class ClientB :public CallBackObject
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{
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public:
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virtual ~ClientB() {}
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virtual int CallBackFunc(int val)
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{
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return val * val;//6
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}
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void RequestB(Server& srv) {
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cout << "平方和=" << srv.Total(*this) << endl;//7
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}
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};
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//主函数1
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int main()
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{
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Server srv2(2), srv5(5);
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ClientA a;
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a.RequestA(srv2); //输出3
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a.RequestA(srv5); //输出15
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//主函数2
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Server ssrv3(3);
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ClientB b;
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b.RequestB(srv2);
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b.RequestB(srv3);
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return 0;
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}
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/*
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1)请分别给出空格1 - 5中正确的代码，使得主函数1的输出为3和15.
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2)请分别给出空格6 - 7中正确的代码，使得主函数2的输出为：
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平方和 = 5
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平方和 = 14
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3)请重新实现ClientB中的相关函数，使得主函数2的输出为：
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1 2 的立方和 = 9
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1 2 3 的立方和 = 36
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*/ |