实验四 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 
//       size和symbol是类Graph的私有成员数据 
void Graph::draw() {
    int i, j;
    for (i = 1; i <= size; i++) {        
        for (j = 1; j <= size - i;j++)    
            cout << " ";                 
        for (j = 1; j <= i * 2 - 1; j++)
            cout << symbol;                
        for (j = 1; j <= size - 1; j++)
            cout << " ";                 
        cout << endl;
    }
    // 补足代码，实现「实验4.pdf」文档中展示的图形样式 
}

class Fraction {
public:
    Fraction();            
    Fraction(int x, int y);
    Fraction(int x);       
    void show();           
    void add(Fraction &f1);
    void sub(Fraction &f1);
    void mul(Fraction &f1);
    void div(Fraction &f1);
    void compare(Fraction f1, Fraction f2);
private:
    int top; int bottom;   
};

#include<iostream>
#include"Fraction.h"
using namespace std;
Fraction::Fraction() {      
    top = 0; bottom = 1;
}
Fraction::Fraction(int x, int b) { 
    top = x; bottom = b;
}
Fraction::Fraction(int x) {        
    top = x; bottom = 1;
}
void Fraction::add(Fraction &f1) {   //加 
     Fraction f2;
     f2.top = top * f1.bottom + f1.top*bottom;
     f2.bottom = bottom * f1.bottom;
     f2.show();
}
 void Fraction::sub(Fraction &f1) {    // 
     Fraction f2;
     f2.top = top * f1.bottom - f1.top*bottom;
     f2.bottom = bottom * f1.bottom;
     f2.show();
 }
 void Fraction::mul(Fraction &f1) {   //乘
     Fraction f2;
     f2.top =top*f1.top;
     f2.bottom =bottom*f1.bottom;
     f2.show();
 }
 void Fraction::div(Fraction &f1) {   //除
     Fraction f2;
     f2.top =top*f1.bottom;
     f2.bottom = bottom * f1.top;
     f2.show();
 }
 void Fraction::compare(Fraction f1, Fraction f2)//比较
 {
     float a = float(f1.top) / float(f1.bottom); float b = float(f2.top) / float(f2.bottom);
     if (a <= b)
     {
         cout << f1.top << "/" << f1.bottom << "<=";
         f2.show();
         cout << endl;
     }
      if (a > b)
      {
          cout << f1.top << "/" << f1.bottom << ">";
          f2.show();
          cout << endl;
      }
  } 
  void Fraction::show(){
      cout<<top<<"/"<<bottom<<endl;
  }

#include<iostream>
#include"Fraction.h"
using namespace std;
int main()
{
    Fraction a;
    Fraction b(3,4);
    Fraction c(5);
    a.show();
    b.show();
    c.show();
    b.add(c);
    b.sub(c);
    b.mul(c);
    b.div(c);
    a.compare(b,c);
    return 0;
}

第一题只需写一个程序比较容易，经过第二题我发现我的类方面的知识基础还不够扎实，多次参考了一些同学好的思路，以后还得多多练习