实验4

 

#include <iostream>
using namespace std;
                                //类的定义graph.h

class Graph{
    public:
        Graph(char c,int m);
        void draw();
    private:
        char ch;int n;
};
Graph::Graph(char c,int m){      //类的实现graph.cpp
    ch=c;n=m;
}
void Graph::draw(){
    for(int l=1;l<=n;l++)
    {
        for(int j=1;j<n-l+1;j++)
        cout<<" ";
        for(int k=1;k<=2*l-1;k++)
        cout<<ch;
        cout<<endl;
    }
}
int main()                  //main.cpp
{
Graph Graph1('*',5);
Graph1.draw();
Graph Graph2('$',7);
Graph2.draw();
}

 

 

 

 

#include <iostream>
using namespace std;
class Fraction{                           
    public:
        Fraction(int t,int b);
        double get(){
            double m;
            m=(double)top/(double)bottom;
            return m ;
        }
        
    private:
        int top;
        int bottom;
};
Fraction::Fraction(int t,int b){
    top=t;bottom=b;
}



class FractionOperation{                                               // 组合类
    private:
        Fraction f1,f2;
    public:
        FractionOperation(Fraction xf1,Fraction xf2);
    double add() {cout<<(f1.get()+f2.get());}
        double sub() {cout<<f1.get()-f2.get();}
        double mul() {cout<<f1.get()*f2.get();}
        double div() {cout<<f1.get()/f2.get();}
        void compare() {
            if(f1.get()-f2.get()>0) cout<<"前者大于后者"<<endl;
            if(f1.get()-f2.get()<0) cout<<"前者小于后者"<<endl;
        }
        
        
};
FractionOperation::FractionOperation(Fraction xf1,Fraction xf2):f1(xf1),f2(xf2){
    f1=xf1;f2=xf2;
    
}

int main()                                                          //main.cpp文件中
{            
    Fraction f1(3,4);Fraction f2(5,4);
    FractionOperation FractionOperation1(f1,f2);
    FractionOperation1.add();cout<<endl;
    FractionOperation1.sub();cout<<endl;
    FractionOperation1.mul();cout<<endl;
    FractionOperation1.div();cout<<endl;
    FractionOperation1.compare();
    double x=f1.get();cout<<x<<endl;
    double y=f2.get();cout<<y<<endl;
    return 0;
}

 

 

 

 

  

 

     总结：

       分文件插入改为注释了，效果差不多。本次实验感觉做得有点吃力，花了很长时间勉强运行出结果，第一题比较简单，用到之前看过的常数易变法分析一下就行了。关键第二题用到组合类的知识，有点不太熟悉。编程的时候会经常出现一些问题，反复调试检查才能发现。