四则运算出题器（C++）-BUG修复

定制题目数量这个功能测试：

（1）输入题目数为负数时：

可正确处理；

（2）输入题目数量为0时：

可正确处理；

（3）输入题目数量为小数时：

程序运行出错；

错误分析：

因为代码中题目数量的变量Ques1定义为int类型，无法处理小数。

解决方法：

将Ques1定义为double类型，然后使用floor()函数，将Ques1取整。

输入10.1：

可以正常处理。

修改后完整代码：

#include<iostream.h>
#include<stdlib.h>
#include<time.h>
#include<math.h>
int main()
{
    double Ques1=1;
    int Ques01;
    int Ques2=1;
    int Ques3=100;
    char Ques4='y';
    int Ques5=1;
    char Ques6='n';
    char Ques7='n';
Again:
    cout<<"请输入题目数量：";
    cin>>Ques1;
    Ques01=floor(Ques1);
    cout<<"请输入每行打印题目数（1-5）：";
    cin>>Ques2;
    cout<<"请输入算式中数值的最大值：";
    cin>>Ques3;
    while(1)
    {
        cout<<"运算中需要乘除法吗？y：需要；n：不需要";
        cin>>Ques4;
        cout<<"减法运算需要有负数吗？y：需要；n：不需要";
        cin>>Ques7;
        cout<<"行间距(正整数)：";
        cin>>Ques5;
        srand(time(NULL));
        if(Ques4=='y')
        {
            while(1)
            {
                if(Ques1<1)
                {
                    cout<<"输入有误，请重新输入题目数量:";
                    cin>>Ques1;
                    Ques01=floor(Ques1);
                }
                else
                {
                    for(int j=0;j<Ques01;j++)
                    {
                        if(j!=0&&j%Ques2==0)
                        {
                            for(int i=0;i<Ques5;i++)
                            {
                                cout<<endl;
                            }        
                        }
                        int num1=rand()%Ques3;
                        int num2=rand()%Ques3;
                        int sign=rand()%4;
                        switch(sign)
                        {
                        case 0:
                            cout<<j+1<<":"<<" "<<num1<<"+"<<num2<<"="<<"	";
                            break;
                        case 1:
                            if(Ques7=='y')
                            {
                                cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"	";
                            }
                            else
                            {
                                if(num1>num2)
                                {
                                    cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"	";
                                }
                                else
                                {
                                    cout<<j+1<<":"<<" "<<num2<<"-"<<num1<<"="<<"	";
                                }
                            }
                            break;
                        case 2:
                            cout<<j+1<<":"<<" "<<num1<<"*"<<num2<<"="<<"	";
                            break;
                        case 3:
                            if(num2!=0)
                            {
                                cout<<j+1<<":"<<" "<<num1<<"/"<<num2<<"="<<"	";
                            }
                            else
                            {
                                j--;
                            }
                            break;
                        }
                    }
                    break;
                }
            }
            break;
        }
        if(Ques4=='n')
        {
            while(1)
            {
                if(Ques01<1)
                {
                    cout<<"输入有误，请重新输入题目数量:";
                    cin>>Ques1;
                    Ques01=floor(Ques1);
                }
                else
                {
                    for(int j=0;j<Ques01;j++)
                    {
                        if(j!=0&&j%Ques2==0)
                        {
                            for(int i=0;i<=Ques5;i++)
                            {
                                cout<<endl;
                            }
                        }
                        int num1=rand()%Ques3;
                        int num2=rand()%Ques3;
                        int sign=rand()%2;
                        switch(sign)
                        {
                        case 0:
                            cout<<j+1<<":"<<" "<<num1<<"+"<<num2<<"="<<"	";
                            break;
                        case 1:
                            if(Ques7=='y')
                            {
                                cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"	";
                                break;
                            }
                            else
                            {
                                if(num1>num2)
                                {
                                    cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"	";
                                    break;
                                }
                                else
                                {
                                    cout<<j+1<<":"<<" "<<num2<<"-"<<num1<<"="<<"	";
                                    break;
                                }
                            }
                            break;
                        }
                    }
                }
                break;
            }
            break;
        }
        
        else
        {
            cout<<"输入有误,请按要求输入!"<<endl;
        }
    }
    cout<<endl;
    while(1)
    {
        cout<<"还需要继续出题还是退出？(y：继续出题；n：退出)";
        cin>>Ques6;
        if(Ques6=='y')
        {
            goto Again;
        }
        if(Ques6=='n')
        {
            goto Exit;
        }
        else
        {
            cout<<"输入有误，请重新输入：";
        }
    }
Exit:
    return 0;
}