c++实验4

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


int main() {

    Graph graph1('*',5), graph2('$',7) ;  // 定义Graph类对象graph1, graph2 
    graph1.draw(); // 通过对象graph1调用公共接口draw()在屏幕上绘制图形 
    graph2.draw(); // 通过对象graph2调用公共接口draw()在屏幕上绘制图形
    graph1.setcolor('y','g');
    graph1.draw();
    graph2.setcolor('r','w');
    graph2.draw();
    return 0; 
} 

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

// 带参数的构造函数的实现 
Graph::Graph(char ch, int n): symbol(ch), size(n) {
}
void Graph::draw(){
    int i,j;
    for(i=0;i<size;i++){
        for(j=1;j<=2*size-1;j++){
        if(j>=size-i&&j<=size+i)
        cout<<symbol;
        else
        cout<<' ';
    }
    cout<<endl;
    }
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),(forecolor)|(backcolor));
};
int Graph::str(char a){
    switch(a){
        case 'b':return 0;break;
        case 'g':return 2;break;
        case 'r':return 4;break;
        case 'p':return 5;break;
        case 'y':return 6;break;
        case 'w':return 7;break;

    }
}
void Graph::setcolor(char fore,char back){
    forecolor=str(fore);
    backcolor=str(back);
}

// 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 
    // 补足代码，实现「实验4.pdf」文档中展示的图形样式 

 // 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 
        void setcolor(char fore,char back);
    private:
        char symbol;
        int size;
        unsigned forecolor,backcolor;
        int str(char a); 
};

#include"Fraction.h"
#include<iostream>
#include<cmath>
using namespace std;
int Fraction::gct(int a,int b){
	return a%b==0?b:gct(b,a%b);
}
Fraction::Fraction():top(0),bottom(1){
}
Fraction::Fraction(int t):top(t),bottom(1){
}
Fraction::Fraction(int t,int b):top(t),bottom(b){
}
void Fraction::add(Fraction &p){
	top=top*p.bottom+p.top*bottom;
	bottom=bottom*p.bottom;
	form();
	op();
}
void Fraction::sub(Fraction &p){
	top=top*p.bottom-p.top*bottom;
	bottom=bottom*p.bottom;
	form();
	op();
}
void Fraction::mul(Fraction &p){
	top=top*p.top;
	bottom=bottom*p.bottom;
	form();
	op();
}
void Fraction::div(Fraction &p){
	top=top*p.bottom;
	bottom=p.top*bottom;
	form();
	op();
}
void Fraction::form(){
    if(bottom<0){
    	bottom*=-1;
    	top*=-1;
	}
	int g=gct(abs(top),abs(bottom));
	top/=g;
	bottom/=g;
}
void Fraction::ip(){
	cout<<"输入分子"<<endl;
	cin>>top;
	int bo;
	cout<<"输入分母"<<endl;
	cin>>bo;
	while(bo==0){
    cout<<"请重新输入"<<endl;
    cin>>bo;
	} 
	bottom=bo;
}
void Fraction::op(){
	form();
	if(bottom!=1)
	cout<<top<<"/"<<bottom<<endl;
	else
	cout<<top<<endl;
}

　　

#include"Fraction.h"
#include<iostream>
#include<cmath>
using namespace std;
int main(){
	Fraction a;
	Fraction b(3,4);
	Fraction c(5);
	cout<<"输出a的初值"<<endl;
	a.op();
	cout<<"输入a"<<endl;
	a.ip();
	cout<<"a的新值"<<endl;
	a.op();
	cout<<"输出b,c"<<endl;
	b.op();
	c.op();
	cout<<"b,c的加减乘除"<<endl;
	b.add(c);
	b.sub(c);
	b.mul(c);
	b.div(c);    
 
	return 0;
}

　　

class Fraction { private: int top; int bottom; int gct(int a,int b); public: Fraction(); Fraction(int t); Fraction(int t,int b); void add(Fraction &p); void sub(Fraction &p); void mul(Fraction &p); void div(Fraction &p); void for

m(); void ip(); void op(); };