软件工程个人作业02

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题目要求:

可怜的二柱子同学,老师又对他的自动出题系统提出了新的要求: 1、题目避免重复; 2、可定制(数量/打印方式); 3、可以控制下列参数: 是否有乘除法; 是否有括号(最多可以支持十个数参与计算); 数值范围; 加减有无负数; 除法有无余数!

1.设计思路

(1)题目避免重复:把生成的随机数和运算符号用数组保存,调用for循环判断因数和符号是否与之前生成的算式相同,若相同则重新产生。

(2)文件输出。

(3.1)生成运算符号的随机数改为只有乘除。

(3.2)暂没实现。

(3.3)用户输入运算结果范围,用数组保存结果,条件语句判断,若范围越界重新产生,否则输出。

(3.4)用户选择是否包含负数运算,用数组保存结果,比较结果与零的大小。按用户条件产生运算式。

(3.5)用户选择除法运算是否有余数,用数组保存余数,判断若余数不为零则用被除数减去余数得到新的算式。

2.源程序代码

//Jiang LingJun 2016,03,07

#include <iostream>

#include <cstdlib>

#include <ctime>

#include <fstream>

#define N 100000

using namespace std;

void Display1();

void Display2();

void Display3();

void Display4();

void Abbreviation(int &x,int &y)//分数化简

{

         for(int i=x;i>0;i--)

                   if(x%i==0&&y%i==0)

                   {

                            x=x/i;

                            y=y/i;

                            break;

                   }

}

//生成自定义个四则运算题

void DisplayAll()

{

                   srand(unsigned(time(0)));//用系统时间生成随机数种子

                   int I;

                   cout<<"请输入出题数量:\n";

                   cin>>I;

                   ofstream outfile("题设不做要求.txt",ios::out);

                   //定义文件流对象,打开磁盘文件"题设不做要求.txt"(未指明路径保存在创建的项目的文件夹中)

                            if(!outfile)

                            {

                                     cerr<<"open error!"<<endl;

                                     exit(1);

                            }

                   for(int i=0;i<I;i++)

                   {

                            int c;

                            char s;//定义字符型变量表示随机产生的运算符

                            c=rand()%4;//利用系统时间产生随机数

                            int a,b,d,f;

                            a=rand()%99+1;

                            b=rand()%99+1;

                            d=rand()%99+1;

                            f=rand()%99+1;//随机数生成数学题中的因子

                            switch (c)

                            {

                                               case 0: s=‘+‘;break;

                                               case 1: s=‘-‘;break;

                                               case 2: s=‘*‘;break;

                                               case 3: s=‘/‘;break;

                            }

                            //题目无重复

                            int j[N],k[N];

                            char l[N];

                            j[i]=a;

                            k[i]=b;

                            l[i]=s;

                            for(int q=i-1;q>=0;q--)

                            {

                                     if(j[q]==j[i]&&k[q]==k[i]&&l[q]==l[i])

                                     {

                                               a=rand()%99+1;

                                               b=rand()%99+1;

                                               c=rand()%2;

                                     }

                            }//题目无重复

                                     int e;

                                     e=rand()%2;//随机生成真分数运算或者整数运算题的变量

                                     switch(e)

                                               {

                                                        case 0://生成整数运算题的情况

                                                                           outfile<<a<<s<<b<<"="<<endl;

                                                                           cout<<a<<s<<b<<"="<<endl;

                                                                           break;

                                                        case 1://生成真分数运算题的情况

                                                                           if(a<b&&d<f&&c>=2)//真分数相乘除的情况

                                                                                    {

                                                                                             Abbreviation(a,b);

                                                                                             Abbreviation(d,f);

                                                                                             outfile<<a<<"/"<<b<<s<<"("<<d<<"/"<<f<<")"<<"="<<endl;

                                                                                              cout<<a<<"/"<<b<<s<<"("<<d<<"/"<<f<<")"<<"="<<endl;

                                                                                    }

                                                                           else if(a<b&&d<f&&c<2)//真分数相加减的情况

                                                                                    {

                                                                                      Abbreviation(a,b);

                                                                                      Abbreviation(d,f);

                                                                                      outfile<<a<<"/"<<b<<s<<d<<"/"<<f<<"="<<endl;

                                                                                      cout<<a<<"/"<<b<<s<<d<<"/"<<f<<"="<<endl;

                                                                                    }

                                                                           else

                                                                                    i--;//重新生成题目,保证30道题的数量

                                                                                             break;

                                                                 }

         }

}

void main()

{

         int A=1;

         while (A)

         {

         int  C;

         cout <<"请选择出题要求:\n";

         cout <<"1 只有乘除\n";

         cout <<"2 确定数值范围\n";

         cout <<"3 确定结果有无负数\n";

         cout <<"4 确定结果有无余数(其中分数运算不计)\n";

         cout <<"输入其他数退出\n";

         cin >> C;

         if(C==1)

                   Display1();

         else if(C==2)

                   Display2();

         else if(C==3)

                   Display3();

         else if(C==4)

                   Display4();

         else

                   A=0;

         }

}

 

//可控参数:乘除

void Display1()

{

            srand(unsigned(time(0)));//用系统时间生成随机数种子

                   int I;

                   cout<<"请输入出题数量:\n";

                   cin>>I;

                   ofstream outfile("只有乘除法.txt",ios::out);

                   //定义文件流对象,打开磁盘文件"只有乘除法.txt"(未指明路径保存在创建的项目的文件夹中)

                   if(!outfile)

                   {

                            cerr<<"open error!"<<endl;

                            exit(1);

                   }

                   for(int i=0;i<I;i++)

                   {

                            int c;

                            char s;//定义字符型变量表示随机产生的运算符

                            c=rand()%2;//利用系统时间产生随机数

                            switch (c)

                            {

                                               case 0: s=‘*‘;break;

                                               case 1: s=‘/‘;break;

                            }

                            int a,b;

                                     a=rand()%99+1;

                                     b=rand()%99+1;

                                     int j[N],k[N];

                                     char l[N];

                                     j[i]=a;

                                     k[i]=b;

                                     l[i]=s;

                                     for(int q=i-1;q>=0;q--)

                                     {

                                               if(j[q]==j[i]&&k[q]==k[i]&&l[q]==l[i])

                                               {

                                                        c=rand()%2;

                                                        a=rand()%99+1;

                                                        b=rand()%99+1;

                                               }

                                     }

                                     outfile<<a<<s<<b<<"="<<endl;

                                     cout<<a<<s<<b<<"="<<endl;

                   }

}

 

//可控参数:数值范围

void Display2()

{

         int min,max;

         cout<<"请输入计算题数值范围的最小数:";

         cin>>min;

         cout<<"请输入计算题数值范围的最大数:";

         cin>>max;

                            srand(unsigned(time(0)));//用系统时间生成随机数种子

                   int I;

                   cout<<"请输入出题数量:\n";

                   cin>>I;

                   ofstream outfile("限制结果范围.txt",ios::out);

                   //定义文件流对象,生成磁盘文件"限制结果范围.txt"(未指明路径保存在创建的项目的文件夹中)

                   if(!outfile)

                   {

                            cerr<<"open error!"<<endl;

                            exit(1);

                   }

                   for(int i=0;i<I;i++)

                   {

                            int c,D;

                            char s;//定义字符型变量表示随机产生的运算符

                            c=rand()%4;//利用系统时间产生随机数

                                     int a,b,d,f;

                                     a=rand()%99+1;

                                     b=rand()%99+1;

                                     d=rand()%99+1;

                                     f=rand()%99+1;//随机数生成数学题中的因子

                            switch (c)

                            {

                                               case 0: s=‘+‘;D=a+b;break;

                                               case 1: s=‘-‘;D=a-b;break;

                                               case 2: s=‘*‘;D=a*b;break;

                                               case 3: s=‘/‘;D=a/b;break;

                            }

                            //控制题目无重复

                            int j[N],k[N];

                            char l[N];

                            j[i]=a;

                            k[i]=b;

                            l[i]=s;

                            for(int q=i-1;q>=0;q--)

                            {

                                     if(j[q]==j[i]&&k[q]==k[i]&&l[q]==l[i])

                                     {

                                               a=rand()%99+1;

                                               b=rand()%99+1;

                                               c=rand()%2;

                                     }

                            }//题目无重复

                                     int e;

                                     e=rand()%2;//随机生成真分数运算或者整数运算题的变量

                                     switch(e)

                                     {

                                               case 0://生成整数运算题的情况

                                                        if(D>=min&&D<=max)

                                                        {

                                                                           cout<<a<<s<<b<<"="<<endl;

                                                                           outfile<<a<<s<<b<<"="<<endl;

                                                                           break;

                                                        }

                                                        else

                                                                 i--;break;

                                               case 1://生成真分数运算题的情况

                                                                 if(a<b&&d<f&&c>=2)//真分数相乘除的情况

                                                                           {

                                                                                    Abbreviation(a,b);

                                                                                    Abbreviation(d,f);

                                                                                    if(D>=min&&D<=max)

                                                                                    {

                                                                                         cout<<a<<"/"<<b<<s<<"("<<d<<"/"<<f<<")"<<"="<<endl;

                                                                                         outfile<<a<<"/"<<b<<s<<"("<<d<<"/"<<f<<")"<<"="<<endl;

                                                                                    }

                                                                                    else

                                                                                             i--;

                                                                           }

                                                                 else if(a<b&&d<f&&c<2)//真分数相加减的情况

                                                                           {

                                                                             Abbreviation(a,b);

                                                                             Abbreviation(d,f);

                                                                             if(D>=min&&D<=max)

                                                                             {

                                                                                    cout<<a<<"/"<<b<<s<<d<<"/"<<f<<"="<<endl;

                                                                                    outfile<<a<<"/"<<b<<s<<d<<"/"<<f<<"="<<endl;

                                                                             }

                                                                             else

                                                                                      i--;

                                                                           }

                                                                 else

                                                                           i--;//重新生成题目,保证30道题的数量

                                                                                    break;

                   }

         }

}

 

//可控参数:结果有无负数

void Display3()

{

         int A;

         cout<<"请选择:\n";

         cout<<"1 结果可有负数\n";

         cout<<"2 结果不可有负数\n";

         cin>>A;

         if(A==1)

         {

                   DisplayAll();

         }

         else

         {

                   int min=0;

                   srand(unsigned(time(0)));//用系统时间生成随机数种子

                   int I;

                   cout<<"请输入出题数量

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