四则运算改进，结果判断

一、设计思路

      将答案存入数组a，余数存入数组b中。与用户输入的答案进行比较。

二、设计代码

/*程序名：四则运算*/
#include<iostream.h>
#include<stdlib.h>
#include<iomanip.h>
int answer(int a[],int b[],int length)  //判断正误
{
    int answer[100];
    int yushu[100];
    int sum=0;
    for(int i=0;i<length;i++)
    {
       if(b[i]!=0)
       {
          cout<<"请输入第"<<i+1<<"道题商和余数:";
          cin>>answer[i]>>yushu[i];
          if(a[i]==answer[i]&&b[i]==yushu[i])
          {
              sum=sum+1;
          }
       }
       else
       {
           cout<<"请输入第"<<i+1<<"道题结果:";
           cin>>answer[i];
           if(a[i]==answer[i])
           {
               sum=sum+1;
           }
       }
    }
    return sum;
}
int jisuan(char a,int op1,int op2)   //计算题目正确结果
{
    int correct;
    switch(a)
    {
        case '+':correct=op1+op2;break;
        case '-':correct=op1-op2;break;
        case '*':correct=op1*op2;break;
        case '/':correct=op1/op2;break;
    }
    return correct;
}

int main()
{
    int a[100];
    int b[100]={0};
    int op1,op2;
    int min,max;
    int judgeopera;   //有无乘除判断
    int judgesign;    //有无正负判断
    int judgeremain;  //有无余数判断
    int count;        //题目数量
    int yunsuan;      //确定运算符
    int j;
    int row;          //行间隔
    int column;
    int flag=0;
    srand((unsigned)time(0));
    cout<<"请输入数值范围:";
    cin>>min>>max;
    cout<<"请输入输出行间隔:";
    cin>>row;
    cout<<"请输入输出列数:";
    cin>>column;
    char yun[5]={'+','-','*','/'};
    cout<<"输入题目数量:";
    cin>>count;
    cout<<"是否含有乘除(1表示Yes，2表示No)";
    cin>>judgeopera;
    while(judgeopera!=1&&judgeopera!=2)                 //如果输入不符合，重新输入
    {
        cout<<"重新输入：";
        cin>>judgeopera;
    }
    cout<<"是否允许负数存在(1表示Yes，2表示No)";
    cin>>judgesign;
    while(judgesign!=1&&judgesign!=2)
    {
        cout<<"重新输入：";
        cin>>judgesign;
    }
    if(judgeopera==1)
    {
        cout<<"有乘除法时是否允许余数存在(1表示Yes，2表示No)";
        cin>>judgeremain;
        while(judgeremain!=1&&judgeremain!=2)
        {
            cout<<"重新输入：";
            cin>>judgeremain;
        }
    }
    char q;
    int sum;
    for(int i=0;i<count;i++)
    {

        op1=int(rand()%(max-min+1))+min;
        op2=int(rand()%(max-min+1))+min;
        if(judgeopera==1)
        {
            yunsuan=int(rand()%4);
            if(judgesign==1)
            {
                if(judgeremain==1)                                 //有乘除，有负数，有余数部分
                {
                    cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                    flag=flag+1;
                    if(yunsuan==3)
                    {
                        a[i]=op1/op2;
                        b[i]=op1%op2;
                    }
                    else
                    {
                        a[i]=jisuan(yun[yunsuan],op1,op2);
                    }
                }
                else                                               //由乘除，有负数，无余数部分
                {
                    if(yunsuan==3)
                    {
                        while(op1%op2!=0)
                        {

                            op1=int(rand()%(max-min+1))+min;
                            op2=int(rand()%(max-min+1))+min;
                        }
                        cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                        flag=flag+1;
                        a[i]=jisuan(yun[yunsuan],op1,op2);
                    }
                    else
                    {
                        cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                        flag=flag+1;
                        a[i]=jisuan(yun[yunsuan],op1,op2);
                    }
                }
            }
            else                        //有乘除，无负数，
            {
                if(yunsuan==1)
                {
                    while(op1<op2)
                    {

                        op1=int(rand()%(max-min+1))+min;
                        op2=int(rand()%(max-min+1))+min;
                    }
                    cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                    flag=flag+1;
                    a[i]=jisuan(yun[yunsuan],op1,op2);
                }
                else
                {
                    if(judgeremain==1)    //有乘除，无负数，有余数部分
                    {
                        cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                        flag=flag+1;
                        if(yunsuan==3)
                        {
                            a[i]=op1/op2;
                            b[i]=op1%op2;
                        }
                        else
                        {
                            a[i]=jisuan(yun[yunsuan],op1,op2);
                        }
                    }
                    else
                    {
                        if(yunsuan==3)
                        {
                            while(op1%op2!=0)
                            {
                                op1=int(rand()%(max-min+1))+min;
                                op2=int(rand()%(max-min+1))+min;
                            }
                            cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                            flag=flag+1;
                            a[i]=jisuan(yun[yunsuan],op1,op2);
                        }
                        else
                        {
                            cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                            flag=flag+1;
                            a[i]=jisuan(yun[yunsuan],op1,op2);
                        }
                     }
                }
            }
        }
        else  //无乘除部分
        {

            yunsuan=int(rand()%2);
            if(judgesign==1)
            {
                cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                flag=flag+1;
                a[i]=jisuan(yun[yunsuan],op1,op2);
            }
            else
            {
                if(yunsuan==1)
                {
                    while(op1<op2)
                    {
                        op1=int(rand()%(max-min+1))+min;
                        op2=int(rand()%(max-min+1))+min;
                    }
                    cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                    flag=flag+1;
                    a[i]=jisuan(yun[yunsuan],op1,op2);
                }
                else
                {
                    cout<<i+1<<"、"<<op1<<yun[yunsuan]<<op2<<"	";
                    flag=flag+1;
                    a[i]=jisuan(yun[yunsuan],op1,op2);
                }
            }
        }
        if(flag==column)
        {
            for(int p=0;p<=row;p++)   //行间隔设置
            {
                cout<<endl;
            }
            flag=0;
        }
    }
    cout<<endl;
    sum=answer(a,b,count);
    cout<<"正确题数:"<<sum<<endl;
    cout<<"错误题数:"<<count-sum<<endl;
    return 0;
}

三、截图

四、实验总结

    本次实验运用了函数，本来对函数传参是不太懂得。经过这次实验，掌握那么一点点。

    本来是输出一道题目，输出一道题目，让用户输入结果，这样导致列数不易控制。于是

统一在题目输完时，输入结果，判断正误。这样更有利于界面完整化、规格化。