实验三

Posted 2021-02-17 jiyuanxiangzhouziying

 

1.基于已有信息，补足并扩充程序。 在graph文件夹里提供有三个文件： graph.h (类Graph的声明) graph.cpp (类Graph的实现) main.cpp (类Graph的测试： 定义Graph类对象，调用绘图接口绘制图形) 要求如下: 新建一个空项目，添加上述三个文件到项目中。 

#ifndef GRAPH_H
#define GRAPH_H
#include<iostream>
using namespace std;
class Graph {
public:
    Graph(char a, int b);
    void draw();
private:
    char symbol;
    int size;
};
Graph::Graph(char a, int b) :symbol(a), size(b) {
}
void Graph::draw()
{
    int i, j;
    for (i = 0; i < size; i++)
    {
        for (j = 0; j < size - i - 1; j++)
            cout << " ";
        for (j = 0; j < 2 * i + 1; j++)
            cout << symbol;
        cout << endl;
    }
}
#endif

graph.h

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

int main()
{
    Graph graph1(‘*‘, 5);
    graph1.draw();
    Graph graph2(‘&‘, 7);
    graph2.draw();
    system("pause");
}

graph.cpp

 2.基于需求描述设计、定义并实现分数类Fraction,并编写代码完成测试。 具体要求如下: 设计一个分数类 Fraction描述分数（两个整数的比值）

#ifndef FRACTION_H
#define FRACTION_H
#include<iostream>
using namespace std;
class fraction {
public:
    fraction(int a = 0, int b = 1) :top(a), bottom(b) {}
    fraction(fraction &c) :top(c.top), bottom(c.bottom) {}
    void jia(fraction &d, fraction &e);
    void jian(fraction &d, fraction &e);
    void cheng(fraction &d, fraction &e);
    void chu(fraction &d, fraction &e);
    void compare(fraction &d, fraction &e);
public:
    int top;
    int bottom;
};
void yue(int, int);
void yue(int x, int y)
{
    int p, q, i = 0;
    if (x > y)
    {
        i = y;
    }
    else i = x;
    while (x%i != 0 || y % i != 0)
    {
        i--;
    }
    p = x / i;
    q = y / i;
    cout << p << "/" << q << endl;
}
void fraction::jia(fraction &d, fraction &e)
{
    int x, y, k;
    x = d.top*e.bottom + e.top*d.bottom;
    y = d.bottom * e.bottom;
    k = x;
    if (x < 0) {
        x = x - 2 * k;
        cout << "-";
        yue(x, y);
    }
    else if (x == 0)
        cout << ‘0‘ << endl;
    else
        yue(x, y);
}
void fraction::jian(fraction &d, fraction &e)
{
    int x, y, k;
    x = d.top*e.bottom - e.top*d.bottom;
    y = d.bottom * e.bottom;
    k = x;
    if (x < 0) {
        x = x - 2 * k;
        cout << "-";
        yue(x, y);
    }
    else if (x == 0)
        cout << ‘0‘ << endl;
    else
        yue(x, y);
}
void fraction::cheng(fraction &d, fraction &e) {
    int x, y, k;
    x = d.top*e.top;
    y = d.bottom*e.bottom;
    k = x;
    if (x < 0) {
        x = x - 2 * k;
        cout << "-";
        yue(x, y);
    }
    else if (x == 0)
        cout << ‘0‘ << endl;
    else
        yue(x, y);
}
void fraction::chu(fraction &d, fraction &e) {
    int x, y, k;
    x = d.top*e.bottom;
    y = d.bottom*e.top;
    if (y < 0)
    {
        x = -x;
        y = -y;
    }
    k = x;
    if (x < 0) {
        x = x - 2 * k;
        cout << "-";
        yue(x, y);
    }
    else if (x == 0)
        cout << ‘0‘ << endl;
    else
        yue(x, y);
}
void fraction::compare(fraction &d, fraction &e) {
    int x, y;
    x = d.top*e.bottom;
    y = e.top*d.bottom;
    cout << "大的数为：";
    if (x > y)
        cout << d.top<<‘/‘<<d.bottom << endl;
    else if (x < y)
        cout << e.top<<‘/‘<<e.bottom<< endl;
    else
        cout << "一样大" << endl;
}
#endif 

fraction.h

#include<iostream>
#include"fraction.h"
using namespace std;
int main() {
    int t1, b1, t2, b2;
    
        cout << "请输入第一个分数" << endl;
        cin >> t1 >> b1;
        cout << "请输入第二个分数" << endl;
        cin >> t2 >> b2;
        if (b1 < 0)
        {
            b1 = -b1;
            t1 = -t1;
        }
        if (b2 < 0)
        {
            b2 = -b2;
            t2 = -t2;
        }
        while (b1 == 0 || b2 == 0)
            return 0;
        fraction a(t1, b1);
        fraction b(t2, b2);
        cout << "两数相加为";
        a.jia(a, b);
        cout << "两数相减为";
        a.jian(a, b);
        cout << "两数相乘为";
        a.cheng(a, b);
        cout << "两数相除为";
        a.chu(a, b);
        a.compare(a, b);


    system("pause");
    return 0;
}

f.cpp

 实验感想：1.关于多文件结构一直不知道在.h文件中要大写头文件名，否则就调用出错。

2.第二个题目一开始是直接做的并没有思考如何去简化算法，只知道可能是循环加循环的做法，所以一开始尝试的时候多花了好长时间，最终改了几次发现只有几行。

3.第一个ball的程序完全是测试出来的，所以就不放出来了。