Coding地址：https://coding.net/u/Julyyun/p/homework/git

一、题目简介

  1. 除了整数以外，还要支持真分数的四则运算，真分数的运算，例如：1/6 + 1/8 = 7/24
  2. 运算符为 +, −, ×, ÷
  3. 并且要求能处理用户的输入，并判断对错，打分统计正确率。
  4. 要求能处理用户输入的真分数， 如 1/2, 5/12 等
  5. 使用 -n 参数控制生成题目的个数，例如执行下面命令将生成10个题目Myapp.exe -n 10

二、需求分析

  编写一段程序，能够输出小学四则运算的题目，并且支持真分数的操作，同时能够对用户输入的答案判定正确与否，给出成绩。

三、功能设计

  1用户能自定义此次题目的数量；

  2能够输出四则运算题目，并支持真分数的运算；

  3能对答案进行判定，并给出正确答案。

四、代码说明

.整数部分
void zhengshu(int m, int a[])
{
    for (int p = 0; p<m; p++)
    {
        int i = (int)rand() % 50;
        int j = (int)rand() % 50;
        int k = (int)rand() % 100 / 25;
        switch (k)
        {
        case 0:
            int o;
            cout << i << "+" << j << "=";
            a[p] = i + j;
            cin >> o;
            if ((i + j) == o)
                cout << "答案正确" << endl;
            else
                cout << "答案错误" << endl;
            break;
        case 1:
            int q;
            cout << i << "-" << j << "=";
            a[p] = i - j;
            cin >> q;
            if ((i - j) == q)
                cout << "答案正确" << endl;
            else
                cout << "答案错误" << endl;
            break;
        case 2:
            int r;
            cout << i << "*" << j << "=";
            a[p] = i*j;
            cin >> r;
            if ((i * j) == r)
                cout << "答案正确" << endl;
            else
                cout << "答案错误" << endl;
            break;
        case 3:
            int s;
            a[p] = i / j;
            cout << i << "/" << j << "=";
            cin >> s;
            if ((i / j) == s)
                cout << "答案正确" << endl;
            else
                cout << "答案错误" << endl;
            break;
        }
    }
}

.真分数部分

void fenshu(int m, int a[][2])
{
    for (int p = 0; p<m; p++)
    {
        int ti,tj;
        int i = (int)rand() %10;
        int j = (int)rand() %10;
        while (j == 0 || i >= j)
        {
            i = (int)rand() %10;
            j = (int)rand() %10;
        }
        int x = (int)rand() %10;
        int y = (int)rand() %10;
        while (y == 0 || x >= y)
        {
            x = (int)rand() %10;
            y = (int)rand() %10;
        }
        int k = (int)rand() % 100 / 25;
        switch (k)
        {
        case 0:
            cout << "(" << i << "/" << j << ")" << "+" << "(" << x << "/" << y << ")" << "=";
            a[p][0] = i*y + x*j;
            a[p][1] = j*y;
            scanf("%d/%d",&ti,&tj); 
            if(a[p][0]==ti && a[p][1]==tj){
                cout << "答案正确" << endl;
            }
            else{
                cout << "答案错误" << endl;
            }
            break;
        case 1:
            cout << "(" << i << "/" << j << ")" << "-" << "(" << x << "/" << y << ")" << "=";
            a[p][0] = i*y - x*j;
            a[p][1] = j*y;
            scanf("%d/%d",&ti,&tj); 
            if(a[p][0]==ti && a[p][1]==tj){
                cout << "答案正确" << endl;
            }
            else{
                cout << "答案错误" << endl;
            }
            break;
        case 2:
            cout << "(" << i << "/" << j << ")" << "*" << "(" << x << "/" << y << ")" << "=";
            a[p][0] = i*x;
            a[p][1] = j*y;
            scanf("%d/%d",&ti,&tj); 
            if(a[p][0]==ti && a[p][1]==tj){
                cout << "答案正确" << endl;
            }
            else{
                cout << "答案错误" << endl;
            }
            break;
        case 3:
            cout << "(" << i << "/" << j << ")" << "/" << "(" << x << "/" << y << ")" << "=";
            a[p][0] = i*y;
            a[p][1] = j*x;
            scanf("%d/%d",&ti,&tj); 
            if(a[p][0]==ti && a[p][1]==tj){
                cout << "答案正确" << endl;
            }
            else{
                cout << "答案错误" << endl;
            }
        }
    }

五、测试运行

 

PSP表格

PSP2.1 Personal Software Process Stages Time (%) Senior Student Time (%)
Planning 计划 8 6
· Estimate 估计这个任务需要多少时间 150 160
Development 开发 80 70
· Analysis 需求分析 (包括学习新技术) 25 20
· Design Spec 生成设计文档 5 5
· Design Review 设计复审 5 5
· Coding Standard 代码规范 3 3
· Design 具体设计 30 20
· Coding 具体编码 80 100
· Code Review 代码复审 7 5
· Test 测试（自我测试，修改代码，提交修改） 15 20
Reporting 报告 10 15
· 测试报告 3 2
· 计算工作量 2 1
· 并提出过程改进计划 3 3