实验三

2.

// 类graph的实现
 
#include "graph.h" 
#include <iostream>
using namespace std;

// 带参数的构造函数的实现 
Graph::Graph(char ch, int n): symbol(ch), size(n) {
}


// 成员函数draw()的实现
// 功能：绘制size行，显示字符为symbol的指定图形样式 
void Graph::draw() {
    int i,j,k;
    for(int i=1;i<=size;i++){
         for(int j=1;j<=size-i;j++)
            cout<<" ";
         for(int k=1;k<=2*i-1;k++)
            cout<<symbol;
        cout<<endl; 
    }
}

#ifndef GRAPH_H
#define GRAPH_H

// 类Graph的声明 
class Graph {
    public:
        Graph(char ch, int n);   // 带有参数的构造函数 
        void draw();     // 绘制图形 
    private:
        char symbol;
        int size;
};


#endif

#include <iostream>
#include "graph.h"
using namespace std;

int main() {
    Graph graph1('*',5);
    graph1.draw();
    
    system("pause");
    system("cls");
    
    Graph graph2('$',7);
    graph2.draw();
    
    return 0; 
} 

3.

#include<iostream>
#include"Fraction.h"
using namespace std;
int main(){
    fraction a;
    cout<<"a:"<<endl;
    a.show();
    fraction b(3,4);
    cout<<"b:"<<endl;
    b.show();
    fraction c(5);
    cout<<"c:"<<endl;
    c.show();
    fraction d;
    cout<<"+:"<<endl;
    d.add(b,c); 
    cout<<"-:"<<endl;
    d.min(b,c);   
    cout<<"*:"<<endl;
    d.mul(b,c);    
    cout<<"/:"<<endl;
    d.div(b,c);   
    cout<<"?:"<<endl;
    d.compare(b,c);
    return 0;
}

#include "fraction.h"
#include<iostream>
using namespace std;

void fraction::add(fraction a , fraction b){
    fraction c;
    c.top=a.top*b.bottom+b.top*a.bottom;
    c.bottom=a.bottom*b.bottom;
    cout<<c.top<<"/"<<c.bottom<<endl;
}

void fraction::min(fraction a , fraction b){
    fraction c;
    c.top=a.top*b.bottom-b.top*a.bottom;
    c.bottom=a.bottom*b.bottom;
    cout<<c.top<<"/"<<c.bottom<<endl;
}

void fraction::mul(fraction a , fraction b){
    fraction c;
    c.top=a.top*b.top;
    c.bottom=a.bottom*b.bottom;
    cout<<c.top<<"/"<<c.bottom<<endl;
}

void fraction::div(fraction a , fraction b){
    fraction c;
    c.top=a.top*b.bottom;
    c.bottom=a.bottom*b.top;
    cout<<c.top<<"/"<<c.bottom<<endl;
}

void fraction::compare(fraction a , fraction b){
    int c1,c2;
    c1=a.top*b.bottom;
    c2=b.top*a.bottom;
    if (c1<c2)
    cout<<a.top<<"/"<<a.bottom<<"<"<<b.top<<"/"<<b.bottom<<endl;
        else if (c1>c2)
        cout<<a.top<<"/"<<a.bottom<<">"<<b.top<<"/"<<b.bottom<<endl;
            else
            cout<<a.top<<"/"<<a.bottom<<"="<<b.top<<"/"<<b.bottom<<endl;
}

void fraction::show(){
    cout<<top<<"/"<<bottom<<endl;
}

#ifndef FRACTION_H
#define FRACTION_H
class fraction{
    public:
        fraction(int i = 0 , int j = 1):top(i),bottom(j){}
        void add(fraction a,fraction b);
        void min(fraction a,fraction b);
        void mul(fraction a,fraction b);
        void div(fraction a,fraction b);
        void compare(fraction a,fraction b);
        void show();
    private:
        int top;
        int bottom;
};

#endif

 

1.编写程序不是很顺利，有很多没有搞懂，问了一下同学，参考了一下他们的程序，还是有一些不会的地方，会改正。

2.程序运行出现了很多错误，发现不出，知识方面欠缺很多，课后会找一些程序参考，发现自己的错误。