四则运算2

 

 

作业描述：

悲催的二柱子接到了老师要求给软件增加一些小小的功能，具体要求如下：

1、除了整数以外，还要支持真分数的四则运算（需要验证结果的正确性）；

2、一次出的题目避免相互重复；

3、可定制出题的数量。

程序源代码：

#include<iostream>

 #include<stdlib.h>

using namespace std;

#include<time.h>

 

char get_oper(int n)

{

      switch(n)

      {

      case 0:return '+';

      case 1:return '-';

      case 2:return '*';

      case 3:return '/';

      }

}

 

int main()

{

      srand(time(NULL));

      int num1=0;

      int num2=0;

      int operators=0;

      int cpl;          //定义每行输出题目个数

      int range;           //定义数值范围

      int answer;        //定义计算结果

      int num;        //定义题目个数

      int JG;                //定义每行间隔

      char m;              //是否有乘除法

      char n;               //加减有无负数

      cout<<"请输入输出题目个数：";

      cin>>num;

      cout<<"请输入数值范围：";

      cin>>range;

      cout<<"请输入每行题目个数：";

      cin>>cpl;

      cout<<"请输入每行间隔：";

      cin>>JG;

      cout<<"是否有乘除法（Y/N）?";

      cin>>m;

      cout<<"是否有负数（Y/N）?";

      cin>>n;

      for(int i=1;i<=num;i++)

      {

                                        //随机产生运算的数和运算符。

           num1=rand()%range;

           num2=rand()%range;

           if(m=='Y')

           {

                 operators=rand()%4;

                 switch(operators)

                 {

                      case 0:answer=num1+num2;break;

                      case 1:answer=num1-num2;break;

                      case 2:answer=num1*num2;break;

                      case 3:answer=num1/num2;

                 }

           }

           else if(m=='N')

           {

                 operators=rand()%2;

                 switch(operators)

                 {

                      case 0:answer=num1+num2;break;

                      case 1:answer=num1-num2;break;

                 }

           }

           if(answer<range)

           {         

                 if(n=='Y')

                 {

                      cout<<num1<<get_oper(operators)<<num2<<"=";

                      for(int j=0;j<=JG;j++)

                            cout<<" ";

                            cout<<"\t";

                      if(i%cpl==0)

                      {

                      cout<<endl;

                      }

                 }

                 else if(n=='N')

                 {

                      i--;

                 }

           }

           else

           {

                 i--;

           }   

      }

      return 0;

}