C++实验4-2

class Graph{
    public:
        Graph(char x,int n);
        void draw();
        private:
            char sign;
            int line;
};

#include"Graph.h"
#include<iostream>
using namespace std;
Graph::Graph(char x,int n):sign(x),line(n){}
void Graph::draw()
{
    int i,j,k,n;
        for(i=1;i<line+1;i++)
    {
        for(j=0;j<line-i;j++)
        cout<<" ";
        for(k=0;k<2*i-1;k++)
            cout<<sign;
        for(n=0;n<line-i;n++)
        cout<<" ";
        cout<<endl;
    }
        
    }

#include"Graph.h"
#include<iostream>
using namespace std;
int main()
{

    Graph graph1('*',5);
    Graph graph2('$',7);
    graph1.draw();
    graph2.draw();
    return 0;
    
}

for循环一开始用的i=0；。。。。结果少了一行后来跟着程序走了一遍发现错误

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#include<iostream>
using namespace std; 
class Fraction{
    public:
        Fraction(int t=0,int b=1):top(t),bottom(b){};
        void output()
        {
            cout<<top<<"/"<<bottom<<endl;
        }
        void input(int t,int B)
        {
            top=t;
            bottom=B;
            
        }
        void add(const Fraction &f);
        void subtract(const Fraction &f);
        void multiply(const Fraction &f);
        void divide(const Fraction &f);
        void compare (const Fraction &f);
        
        private:
        int top;
        int bottom; 
};

#include"Fraction.h"
#include <iostream>
using namespace std;
void Fraction::add(const Fraction &f1)
{
    bottom=bottom*f1.bottom;
    top=top*f1.bottom+f1.top*bottom;
    
}
void Fraction::subtract(const Fraction &f1)
{
    bottom=bottom*f1.bottom;
    top=top*f1.bottom-f1.top*bottom;
}
void Fraction::multiply(const Fraction &f1)
{
    bottom=bottom*f1.bottom;
    top*=f1.top;
}

void Fraction::divide(const Fraction &f1)
{
    bottom*=f1.top;
    top*=f1.bottom;
}
void Fraction::compare (const Fraction &f1)
{
    double x;
    double y;
    x=double(top) /double (bottom) ;
    y=double (f1.top)/double (f1.bottom);
    if(x>y)
    cout<<top<<"/"<<bottom<<">"<<f1.top<<"/"<<f1.bottom;
          
          else if(x<y) 
          
          cout<<top<<"/"<<bottom<<"<"<<f1.top<<"/"<<f1.bottom;
          
        else
         cout<<top<<"/"<<bottom<<"="<<f1.top<<"/"<<f1.bottom;
    }

#include"Fraction.h"
#include<iostream>
using namespace std;
int main ()
{
    int t,y;
    cin>>t>>y;
    Fraction a;
    Fraction b(3,4);
    Fraction c(5);
    Fraction d;
    cout<<"input a fraction named d ="<<endl;
    d.input(t,y);
    d.output();
    cout<<"a=";
    a.output();
    cout<<"b=";
    b.output();
    cout<<"b+c=";
    b.add(c); b.output();
    cout<<"b-c=";
    b.subtract(c); b.output();
    cout<<"b*c="; 
    b.multiply(c); b.output();
    cout<<"b/c="; b.output();
    b.divide(c); b.output();
    cout<<"compare b and c"<<endl;
    b.compare(c);
    return 0;
}

一开始compare设了两个参数 f1 f2 本想输出的时候直接调用output可以减少代码的量后来发现对于第一个的输出f1.output 出了问题改了很久放弃了老老实实瞧出来了

compare由于粗心把f2.bottom 写成了bottom 找了好久好久以为是if的问题老脸泪两行

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