四则运算题目生成程序（基于控制台）

Posted 2020-09-02

 源代码地址：https://git.coding.net/c_xx/02.git

题目描述：

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

需求分析：

1. 支持整数及真分数的四则运算；
2. 能够处理用户的输入并判断对错从而得出正确率；
3. 使用-num参数控制生成题目的个数。

功能设计：

1. 随机产生四则运算符；
2. 随机产生整数或真分数四则运算；
3. 对分数结果实现约分运算；
4. 根据用户需求确定出题数目；
5. 处理用户输入并判断正误，计算正确率。

代码说明：

为了实现需求，共设计了4个功能函数，分别是：

char Operator()            //随机选取运算符

int maxNumber(int k, int l)            //辗转相除法求最大公约数函数

void integer()        //整数运算

void fraction()            //真分数运算

char Operator()            //随机选取运算符
{ 
    char op;
    srand(time(0));
    int i=rand()%4+1; 
    switch(i) 
    { 
        case 1: return \'+\'; 
        case 2: return \'-\'; 
        case 3: return \'*\'; 
        case 4: return \'/\'; 
    } 
}

int maxNumber(int k, int l)            //辗转相除法求最大公约数函数
{
    while(k%l!=0){
        int t=k%l;
        k=l;
        l=t;
    }
    return l;
}

void integer()        //整数运算
{ 
    int g;
    int x,y; 
    char op; 
    srand(time(0));
    x=rand()%100+1; 
    y=rand()%100+1; 
    op=Operator(); 
    cout<<x<<op<<y<<"="<<endl;
    cout<<"请输入运算结果:";
    if(op==\'+\')            //整数“+”运算
    {        
        cin>>g;
        if(g==x+y)
        {
            cout<<"恭喜你答对了！"<<endl<<endl;
            correct++;
        }
        else
        {
            cout<<"很遗憾你答错了，正确答案是："<<x+y<<endl<<endl;
            mistake++;
        }
    }
    else 
        if(op==\'-\')            //整数“-”运算
    {        
        cin>>g;
        if(g==x-y)
        {
            cout<<"恭喜你答对了！"<<endl<<endl;
            correct++;
        }
        else
        {
            cout<<"很遗憾你答错了，正确答案是："<<x-y<<endl<<endl;
            mistake++;
        }
    }
        else 
            if(op==\'*\')            //整数“*”运算
    {        
        cin>>g;
        if(g==x*y)
        {
            cout<<"恭喜你答对了！"<<endl<<endl;
            correct++;
        }
        else
        {
            cout<<"很遗憾你答错了，正确答案是："<<x*y<<endl<<endl;
            mistake++;
        }
    }
        else 
            if(op==\'/\')            //整数“/”运算
    {        
        cin>>result;
        element=x;
        denominator=y;
        maxNum=maxNumber(element,denominator);
        element=element/maxNum;
        denominator=denominator/maxNum;
        if(denominator!=1)
        {

            sprintf_s(answer, "%d/%d",element ,denominator);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
        else
        {
            sprintf_s(answer, "%d",element);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
    }
} 

void fraction()            //真分数运算
{ 
    srand(time(NULL));
    memset(result,0, sizeof(result));
    memset(answer,0, sizeof(answer));
    int a,b,c,d; 
    a=rand()%100+1; 
    b=rand()%100+1; 
    c=rand()%100+1; 
    d=rand()%100+1; 
    char op; 
    while(a<=b||c<=d) 
    { 
        a=rand()%100+1; 
        b=rand()%100+1; 
        c=rand()%100+1; 
        d=rand()%100+1; 
    } 
    op=Operator(); 
    cout<<"("<<b<<"/"<<a<<")"<<op<<"("<<d<<"/"<<c<<")"<<"="<<endl;
    cout<<"请输入运算结果:";
    cin>>result;
    if(op==\'+\')            //分数“+”运算
    {        
        element=(b*c)+(a*d);
        denominator=a*c;
        maxNum=maxNumber(element,denominator);
        element=element/maxNum;
        denominator=denominator/maxNum;
        if(denominator!=1)
        {
            sprintf_s(answer, "%d/%d",element ,denominator);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
        else
        {
            sprintf_s(answer, "%d",element);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
    }
    else 
        if(op==\'-\')            //分数“-”运算
    {        
        element=(b*c)-(a*d);
        denominator=a*c;
        maxNum=maxNumber(element,denominator);
        element=element/maxNum;
        denominator=denominator/maxNum;
        if(denominator!=1)
        {

            sprintf_s(answer, "%d/%d",element ,denominator);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
        else
        {
            sprintf_s(answer, "%d",element);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
    }
        else 
            if(op==\'*\')            //分数“*”运算
    {        
        element=b*d;
        denominator=a*c;
        maxNum=maxNumber(element,denominator);
        element=element/maxNum;
        denominator=denominator/maxNum;
        if(denominator!=1)
        {
            sprintf_s(answer, "%d/%d",element ,denominator);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
        else
        {
            sprintf_s(answer, "%d",element);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
    }
        else 
            if(op==\'/\')            //分数“/”运算
    {    
        element=b*c;
        denominator=a*d;
        maxNum=maxNumber(element,denominator);
        element=element/maxNum;
        denominator=denominator/maxNum;
        if(denominator!=1)
        {

            sprintf_s(answer, "%d/%d",element ,denominator);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
        else
        {
            sprintf_s(answer, "%d",element);
            if (strcmp(answer, result) == 0)
            {
                cout<<"恭喜你答对了！"<<endl<<endl;
                correct++;
            }
            else
            {
                cout<<"很遗憾你答错了，正确答案是："<<answer<<endl<<endl;
                mistake++;
            }
        }
    }
} 

测试运行：

 

PSP展示：

 |||||
|:--|:--|:--|:--|
|**PSP2.1**|**Personal Software Process Stages**|**Time (%) Senior Student(/hour)**|**Time (%)(/hour)**|
|· Planning|计划|2|1.5|
|· Estimate|估计这个任务需要多少时间|38|49|
|· Analysis|需求分析 (包括学习新技术)|2|2.5|
|· Coding Standard|代码规范|0.5|0.5|
|· Design|具体设计|1.5|2|
|· Coding|具体编码|30|40|
|· Test|测试（自我测试，修改代码，提交修改）|1|1|
|Reporting|报告|1|1.5|