实验三

//main.cpp
#include <iostream>
#include"graph.h"
using namespace std;
int main ()
{
    Graph Graph1('*',5);
    Graph1.draw();
    system("pause");
    system("cls");
    Graph Graph2('$',7);
    Graph2.draw();
    system("pause");
    return 0;
}

//Graph.h
#ifndef GRAPH_H
#define GRAPH_H
class Graph
{
    public:
        Graph(char c,int n);
        void draw();
        
    private:
        char c;
        int n;        
};
#endif

//Garph.cpp
#include "Graph.h"
#include<iostream>
using namespace std;
Graph::Graph(char c,int n):c(c),n(n)
{
    cout<<"Construction is called"<<endl;
}
void Graph::draw()
{
    for (int i=1;i<=n;i++)
    {
        for (int j=0;j<n-i;j++)
            cout<<' ';
        for (int j=0;j<2*i-1;j++)
            cout<<c;
        for (int j=0;j<2*n-1;j++)
            cout<<' ';
        cout<<endl;
    }
}

 

//main.cpp
#include <iostream>
#include"Fraction fraction.h"
using namespace std;
void add(Fraction a,Fraction b)
{
    int cbottom=a.bottom*b.bottom;
    int ctop=a.top*b.bottom+a.bottom*b.top;
    cout<<ctop<<"/"<<cbottom<<endl;
}
void min(Fraction a,Fraction b)
    {
        int cbottom=a.bottom*b.bottom;
    int ctop=a.top*b.bottom-a.bottom*b.top;
    cout<<ctop<<"/"<<cbottom<<endl;
    }
void mul(Fraction a,Fraction b)
    {
        int ctop=a.top*b.top;
        int cbottom=a.bottom*b.bottom;
        cout<<ctop<<"/"<<cbottom<<endl; 
    }
void div(Fraction a,Fraction b)
    {
        int ctop=a.top*b.bottom;
        int cbottom=a.bottom*b.top;
        cout<<ctop<<"/"<<cbottom<<endl;
    }
int main ()
{
    Fraction a;
    Fraction b(3,4);
    Fraction c(5);
    add(c,b);
    min(c,b);
    mul(c,b);
    div(c,b);
    return 0;
}

//fraction.h
#ifndef FRACTION_H
#define FRACTION_H
#include <iostream>
using namespace std;
class Fraction
{
public:
    Fraction(int top=0,int bottom=1);
    friend void add(Fraction a,Fraction b);
    friend void min(Fraction a,Fraction b);
    friend void mul(Fraction a,Fraction b);
    friend void div(Fraction a,Fraction b);
private:
    int top,bottom;
};
#endif

//fraction.cpp
#include"Fraction fraction.h"
#include<iostream>
using namespace std;
Fraction::Fraction(int top,int bottom):top(top),bottom(bottom){}