四则运算3

要求：

一、题目避免重复

二、定制（数量/打印方式）

三、控制参数

1.是否有乘除法

2.是否有负数

3.是否有余数

4.答题控制小数点后2位

5.是否有括号

四、控制数字范围

(新要求)五、成功的表示了正确答案和题目答对次数

设计思想：

1、首先题目避免重复可以根据位数和里面的随机数相比较来控制

2、是否有乘除、是否有负数、是否有分数、是否有小数、是否有括号可以根据一个函数来定义所有情况

3.控制数字范围可以用算式%rand（max-min+1）+min来实现

#include<iostream>
#include<stdio.h>
#include<time.h>
#include<fstream>
using namespace std;

int main()
{
    ofstream outfile;
    int i, a, b, c, d, e, f, g, l, m, o, x, y, z, count=0;
    double  finalnum = 0, cnum;
    int number, muldiv, rnum, numf, neg, rem; //muldiv判断乘除,rnum判断随机数,numf数值范围,neg判断有无负数,rem判断有无余数
    char psign, msign; //符号正负
    int bra, braran;      //bra判断是否有括号
    int num, signnum;  //num数字个数,signnum符号个数
    int numarray[20]; //szsz数字数组
    char fh[4] = { '+', '-', '*', '/' }, signarray[10];//fhsz符号数组
    cout << "请输入要打印的数量:";
    cin >> number;
    cout << "请输入数值范围：0-";
    cin >> numf;
    cout << "是否有括号：  1、有  2、无  ：";
    cin >> bra;
    cout << "加减有无负数： 1、有  2、无 :";
    cin >> neg;
    cout << "是否有乘除法： 1、有  2、无 :";
    cin >> muldiv;
    if (muldiv == 1)
    {
        cout << "除法有无余数: 1、有  2、无 :";
        cin >> rem;
    }
    srand((unsigned)time(NULL));//时间种子，每次出现随机数不同

    if (bra == 1)     //判断是否有括号
    {
        braran = 3;
    }
    if (bra == 2)
    {
        braran = 2;
    }

    if (muldiv == 1)           //判断是否有乘除
    {
        rnum = 4;
    }
    if (muldiv == 2)
    {
        rnum = 2;
    }
    for (i = 0; i < number; i++)
    {

        a = rand() % numf;
        b = rand() % numf;
        e = rand() % numf;
        f = rand() % numf;
        if (neg == 1)
        {
            l = rand() % 2;
            m = rand() % 2;
            if (l == 0)          //加减有负数时，随机生成正负号
            {
                psign = '-';
            }
            if (l == 1)
            {
                psign = ' ';
            }
            if (m == 0)
            {
                msign = '-';
            }
            if (m == 1)
            {
                msign = ' ';
            }
        }
        else
        {
            psign = msign = ' ';
        }
        switch (d = rand() % braran)
        {
        case 0:   //整数
        {
            switch (c = rand() % rnum)
            {
            case 0:cout << psign << a << "+" << msign << b << "=" << endl;
                cnum = a + b;
                cin >> finalnum;
                if (psign == ' '&&msign == ' ')
                {
                    cnum = a + b;
                }
                if (psign == '-'&&msign == ' ')
                {
                    cnum = b - a;
                }
                if (psign == ' '&&msign == '-')
                {
                    cnum = a - b;
                }
                if (psign == '-'&&msign == '-')
                {
                    cnum = -a - b;
                }
                if (int(finalnum * 100) == int(cnum * 100))
                {
                    cout << "答案正确！" << endl;
                    count++;
                }
                else
                {
                    cout << "答案错误！" << endl;
                    cout << "正确答案为：" << cnum << endl;
                }
                break;
            case 1:cout << psign << a << "-" << msign << b << "=" << endl;
                cnum = a - b;
                cin >> finalnum;
                if (psign == ' '&&msign == ' ')
                {
                    cnum = a  -  b ;
                }
                if (psign == '-'&&msign == ' ')
                {
                    cnum = -b - a ;
                }
                if (psign == ' '&&msign == '-')
                {
                    cnum = a  + b ;
                }
                if (psign == '-'&&msign == '-')
                {
                    cnum = -a  + b ;
                }
                if (int(finalnum*100) ==int (cnum*100))
                {
                    cout << "答案正确！" << endl;
                    count++;
                }
                else
                {
                    cout << "答案错误！" << endl;
                    cout << "正确答案为：" << cnum << endl;
                }
                break;
            case 2:cout << a << "×" << b << "=" << endl;
                cnum = a * b;
                cin >> finalnum;
                if (int(finalnum * 100) == int(cnum * 100))
                {
                    cout << "答案正确！" << endl;
                    count++;
                }
                else
                {
                    cout << "答案错误！" << endl;
                    cout <<"正确答案为："<< cnum << endl;
                }
                break;
            case 3:
            {
                if (rem == 2)
                {
                    while (b == 0)
                    {
                        b = rand() % numf;
                    }
                    o = a%b;
                    while (o != 0)
                    {
                        b = rand() % numf;
                        while (b == 0)
                        {
                            a = rand() % numf;
                            b = rand() % numf;
                        }
                        o = a%b;
                    }
                }
                else
                {
                    while (b == 0)
                    {
                        b = rand() % numf;
                    }
                }
                cout << a << "÷" << b << "=" << endl;
                cnum = a / b;
                cin >> finalnum;
                if (int(finalnum * 100) == int(cnum * 100))
                {
                    cout << "答案正确！" << endl;
                    count++;
                }
                else 
                {
                    cout << "答案错误！" << endl;
                    cout << "正确答案为：" << cnum << endl;
                }
            }break;
            }
        } break;
        case 1://真分数
        {
            while (a == 0 || b == 0 || a >= b)
            {
                a = rand() % numf;
                b = rand() % numf;

            }
            while (e == 0 || f == 0 || e >= f)
            {
                e = rand() % numf;
                f = rand() % numf;
            }
            switch (g = rand() % rnum)
            {
            case 0: 
            {
                cout << psign << a << "/" << b << "+" << msign << e << "/" << f << "=" << endl;
                cin >> finalnum;
                if (psign == ' '&&msign == ' ')
                {
                    cnum = a / double (b) + e / double(f);
                }
                if (psign == '-'&&msign == ' ')
                {
                    cnum = e / double(f) - a / double (b);
                }
                if (psign == ' '&&msign == '-')
                {
                    cnum = a / double (b) - e / double(f);
                }
                if (psign == '-'&&msign == '-')
                {
                    cnum = -a / double(b) - e / double(f);
                }
                if (int(finalnum * 100) == int(cnum * 100))
                {
                    cout << "答案正确！" << endl;
                    count++;
                }
                else
                {
                    cout << "答案错误！" << endl;
                    cout << "正确答案为：" << cnum << endl;
                }
                break;
            }
            case 1:
            {
                cout << psign << a << "/" << b << "-" << msign << e << "/" << f << "=" << endl;
                cin >> finalnum;
                if (psign == ' '&&msign == ' ')
                {
                    cnum = a / double(b) - e / double(f);
                }
                if (psign == '-'&&msign == ' ')
                {
                    cnum = -(e / double(f)) - (a / double(b));
                }
                if (psign == ' '&&msign == '-')
                {
                    cnum = (a / double(b)) + (e / double(f));
                }
                if (psign == '-'&&msign == '-')
                {
                    cnum = -(a / double(b)) + (e / double(f));
                }
                if (int(finalnum * 100) == int(cnum * 100))
                {
                    cout << "答案正确！" << endl;
                    count++;
                }
                else
                {
                    cout << "答案错误！" << endl;
                    cout << "正确答案为：" << cnum << endl;
                }
                break;
            }cout << "一共答对了：" << count << "题" << endl;
            case 2:
            {
                cout << a << "/" << b << "×" << e << "/" << f << "=" << endl;
                cnum = (a / double(b)) * (e / double(f));
                cin >> finalnum;
                if (int(finalnum * 100) == int(cnum * 100))
                {
                    cout << "答案正确！" << endl;
                    count++;
                }
                else
                {
                    cout << "答案错误！" << endl;
                    cout << "正确答案为：" << cnum << endl;
                }
                break;
            }
            case 3: 
            {
                cout << a << "/" << b << "÷" << e << "/" << f << "=" << endl;
                cnum = (a / double(b)) / (e / double(f));
                cin >> finalnum;
                if (int(finalnum * 100) == int(cnum * 100))
                {
                    cout << "答案正确！" << endl;
                    count++;
                }
                else
                {
                    cout << "答案错误！" << endl;
                    cout << "正确答案为：" << cnum << endl;
                }
            }
            } break;
        } break;
        case 2:
        {
            num = 3 + rand() % 8;     //有括号时，数字和符号数组
            signnum = num - 1;
            for (y = 0; y < num; y++)
            {
                numarray[y] = rand() % numf;
            }
            for (y = 0; y < signnum; y++)
            {
                x = rand() % 4;
                signarray[y] = fh[x];
            }
            signarray[signnum] = '=';
            switch (z = signnum % 2)
            {
            case 0:
            {
                cout << numarray[0];
                cout << signarray[0];
                finalnum =finalnum+numarray[0];
                for (y = 1; y < signnum; y++)
                {
                    cout << "(";
                    cout << numarray[y];
                    cout << signarray[y];
                    cout << numarray[y + 1];
                    cout << ")";
                    switch (y)
                    {
                        case'+':finalnum = finalnum + numarray[y] + numarray[y + 1]; break;
                        case'-':finalnum = finalnum + numarray[y] - numarray[y + 1]; break;
                        case'*':finalnum = finalnum + numarray[y] * numarray[y + 1]; break;
                        case'/':finalnum = finalnum + numarray[y] / numarray[y + 1]; break;
                    }
                    cout << signarray[y + 1];
                    y = y + 1;
                }cout << endl;
            }break;
            case 1:
            {
                for (y = 0; y < signnum; y++)
                {
                    cout << "(";
                    cout << numarray[y];
                    cout << signarray[y];
                    cout << numarray[y + 1];
                    cout << ")";
                    switch (y)
                    {
                        case'+':finalnum = finalnum + numarray[y] + numarray[y + 1]; break;
                        case'-':finalnum = finalnum + numarray[y] - numarray[y + 1]; break;
                        case'*':finalnum = finalnum + numarray[y] * numarray[y + 1]; break;
                        case'/':finalnum = finalnum + numarray[y] / numarray[y + 1]; break;
                    }
                    cout << signarray[y + 1];
                    y = y + 1;
                }
                cout << endl;
                cin >> finalnum;
                if (int(finalnum * 100) == int(cnum * 100))
                {
                    cout << "答案正确！" << endl;
                    count++;
                }
                else
                    cout << "答案错误！" << endl;
                    cout << "正确答案为：" << cnum << endl;
            }break;
            }
        } break;
        }
    }
    cout << "一共答对了：" << count << "题" << endl;
}

心得体会：

1.我们结对开发所以选择了较好的那个程序。

2.因为俩人分工合作，每个人负责不同的功能

3.我们先用一个数代表运算式的结果，然后再在这个数上根据运算符号添加运算             

 

合作伙伴：朱建颖  http://www.cnblogs.com/zjy666/