c++ 实验三

实验三    类和对象

graph类框架

#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

// 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,n=1;
    while (n  <=size)
    {
        for (i = 0; i < size - n; i++)
            cout <<" "<< ends;
        for (i = 0; i < 2 * n - 1; i++)
            cout << symbol << ends;
        n++;
        cout << endl;
    }
    // 补足代码
    // ...
}

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

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

 

 

fraction类框架

#ifndef FRACTION_H
#define FRACTION_H

class Fraction{
public:
    Fraction (int x1=0, int y1=1);
    void add(Fraction c2);
    void sub(Fraction c3);
    void mult(Fraction c4);
    void div(Fraction c5);
    void compare(Fraction c6,Fraction c7);
    void input();
    void output();
private:
    int top;
    int bottom;
};
#endif 

#include<iostream>
#include<cmath>
#include<cstdlib>
int simt(int ,int );
int simb(int, int);
#include "fraction.h"
using std::cout;
using std::endl;
using std::ends;
using std::cin;
int simt(int x, int y)
{
    int fx = x;
    if (x == 0 || y == 0)
        exit(0);
    if (x < 0)
        x = abs(x);
    if (y < 0)
        y = abs(y);
    while (x != y)
    {
        if (x > y)
            x = x - y;
        else
            y = y - x;
    }
    return fx / x;
}
int simb(int x, int y)
{
    int fy = y;
    if (x == 0 || y == 0)
        exit(0);
    if (x < 0)
        x = abs(x);
    if (y < 0)
        y = abs(y);
    while (x != y)
    {
        if (x > y)
            x = x - y;
        else
            y = y - x;
    }
    return fy / x;
}
void Fraction::input()
{
    cin >> top >> bottom;
    if (bottom == 0)
    {
        cout << "wrong input" << endl;
        system("pause");
        exit(0);
    }
}
void Fraction::output()
{
    cout << top << "/" << bottom<<ends;
}
Fraction::Fraction(int x1 , int y1 ) :top(x1), bottom(y1)
{
    if (bottom == 0)
    {
        cout << "wrong input" << endl;
        system("pause");
        exit(0);
    }
}
void Fraction::add(Fraction c2)
{
    if (c2.bottom == 0)
    {
        cout << "wrong input" << endl;
        system("pause");
        exit(0);
    }
    top = top * c2.bottom;
    c2.top = c2.top*bottom;
    bottom = bottom * c2.bottom;
    c2.bottom = bottom;
    cout << "add complete" << endl;
    cout <<  simt((top+c2.top),bottom) << "/" << simb((top+c2.top),bottom) << endl;     
}
void Fraction::sub(Fraction c3)
{
    if (bottom==0&&c3.bottom == 0)
    {
        cout << "wrong input" << endl;
        system("pause");
        exit(0);
    }
    top = top * c3.bottom;
    c3.top = c3.top*bottom;
    bottom = bottom * c3.bottom;
    c3.bottom = bottom;
    cout << "sub complete" << endl;
    cout << simt((top - c3.top),bottom) << "/" <<simb((top-c3.top),bottom) << endl;            
}
void Fraction::mult(Fraction c4)
{
    if (bottom == 0 && c4.bottom == 0)
    {
        cout << "wrong input" << endl;
        system("pause");
        exit(0);
    }
    top = top * c4.top;
    bottom = bottom * c4.bottom;
    cout << "mult complete" << endl;
    cout <<simt(top,bottom)<<"/"<<simb(top,bottom)<< endl;                                        
}
void Fraction::div(Fraction c5)
{
    if (bottom == 0 && c5.bottom == 0)
    {
        cout << "wrong input" << endl;
        system("pause");
        exit(0);
    }
    top = top * c5.bottom;
    bottom = bottom * c5.top;
    cout << "div complete" << endl;
    cout << simt(top,bottom)<<"/"<<simb(top,bottom)<<endl;                                    
}
 void Fraction::compare(Fraction c6,Fraction c7)
{
    Fraction c1, c2;
    c1.top = c6.top * c7.bottom;
    c2.top = c7.top*c6.bottom;
    if (c1.top > c2.top)
    {
        c6.output();
        cout << ">";
        c7.output();
    }
    else
    {
        c6.output();
        cout << "<";
        c7.output();
    }

}

#include"fraction.h"
#include<iostream>
#include<cstdlib>
int main()
{
    Fraction a,d;
    Fraction b(20,40),e(-4,6),f(7,8);
    Fraction c(5);
    b.compare(b, c);
    system("pause");
    b.add(c);
    system("pause");
    b.sub(c);
    system("pause");
    b.mult(c);
    system("pause");
    e.div(f);
    system("pause");
    a.output();
    system("pause");
    d.input();
    system("pause");
    d.output();
    system("pause");
    d.input();
    return 0;
}

 

实验总结：

fraction类的实验写的比较粗糙，化简的函数写的有点啰嗦，分别化简了分子和分母（因为想写在类外面）。给后面的输出带来了一些麻烦。

compare没有化简，因为想要直观的展现原分数的大小关系。（写完之后发现可以用bool类型……555

然后肯定还有很多不足，希望大家指出，谢谢~