小学四则运算3.0

#include<iostream>
#include<sstream>
#include<string>
#include<ctime>
#include<time.h>
#include<fstream>
#define size 10000
using namespace std;
class Calculator
{
    public:
        Calculator() 
        {
            STop=0;
            NTop=0;
            SignTemp=NULL;
            NumTemp=0;
        }
        string num_str(int i);    // int string
        int Operator(int m);
        void compute();    //计算函数
        double Run(int &i,int &length);
        char cal[100][100];
    private:
        char Sign[100],SignTemp; 
        double Num[100],NumTemp;  
        int STop,NTop;
};
string num_str(int i)    //将数字转换为字符串
{
    stringstream ss;
    ss<<i;
    return ss.str();
}

int Operator(int m)    //产生运算符
{
    int a,b;
    char oper;
    a=rand()%4;    //产生随机整数用于除四取余后进行四种运算符号和四种数的选择
    b=rand()%2;
    if(m==2)    //无乘除法情况
    {
        switch(b)    //用于加减运算两种符选择
        {
        case 0:
            oper=‘+‘;
            break;
        case 1:
            oper=‘-‘;
            break;
        default:
            break;
        }
    }
    if(m==1)    //有乘除法情况
    {
        switch(a)          //用于四则运算四种符号的选择
        {
        case 0:
            oper=‘+‘;
            break;
        case 1:
            oper=‘-‘;
            break;
        case 2:
            oper=‘*‘;
            break;
        case 3:
            oper=‘/‘;
            break;    
        default:
            break;
        }
    }
    return oper;
}

void Calculator::compute()
{
    switch (Sign[STop-1]) 
    {
        case ‘+‘: 
            Num[NTop-2]+=Num[NTop-1];//运算后将结果存入
            STop--;
            NTop--;
            break;
        case ‘-‘: 
            Num[NTop-2]-=Num[NTop-1];
            STop--;
            NTop--;
            break;
        case ‘*‘: 
            Num[NTop-2]*=Num[NTop-1];
            STop--;
            NTop--;
            break;
        case ‘/‘:    //判断除数是否为0,0的话结束
            if (Num[STop-1]==0) 
            {
                cout<<"data error!!"<<endl; 
                exit(0);
            }
            else
            {
                Num[NTop-2]/=Num[NTop-1];
                STop--;
                NTop--;
                break; 
            }    //其中STop--;NTop--;实现的是将数据弹出栈
        case ‘)‘: 
            STop=STop-2;
            break;    //发现‘)‘对上个运算符进行判断
    }
}
double Calculator::Run(int &i,int &length)    //运行函数
{
    char temp;
    int p=0;
    while (p<=length)    //读入数据
    { 
        temp=cal[i][p]; 
        if (temp>=‘0‘&&temp<=‘9‘) 
        {
            NumTemp=NumTemp*10+double(temp-48); 
        }
        else 
        {
            Sign[STop]=SignTemp; 
            SignTemp=temp;
            STop++;    //运算符入栈
            if (Sign[STop-1]!=‘)‘ && temp!=‘(‘)     //数字入栈
            {
                Num[NTop]=NumTemp; 
                NTop++; 
                NumTemp=0;
            }   
            switch (temp)    //进行有关运算优先级别的考虑 
            {
            case ‘+‘: 
            case ‘-‘:
                while(Sign[STop-1]!=‘(‘ && STop-1>0) 
                    compute();
                break;    //"+""-"的时候考虑"("
            case ‘*‘:
            case ‘/‘:
                while( Sign[STop-1]!=‘(‘ && Sign[STop-1]!=‘+‘ && Sign[STop-1]!=‘-‘&& STop-1>0 ) 
                    compute();
                break;
            case ‘(‘:
                break;    //继续读取
            case ‘)‘:
                while(Sign[STop-1]!=‘(‘) compute();
                break;
            default: 
                while(STop-1>0) 
                    compute();
                //Num[0];
                break;
                //exit(0);   //结束
            }
        }
        p++;
    }
    return Num[0];
}

int main()    //满足最多十个数值运算
{

    int num1,num2,jishu,i,j,n=0;
    char oper1;
    string s_num1,s_num2,s_connect[size];
    srand((unsigned)time(NULL));    //通过系统时间初始化随机数种子，若不设置则每次产生随机数相同
    int number,value,m;
    cout<<"请输入运算题目数量:"<<endl;  //定制运算题目数量
    cin>>number;
    cout<<"请输入数值产生范围:"<<endl;    //选择数值产生范围
    cin>>value;
    cout<<"请选择运算是否有乘除法:1.有  2.没有"<<endl;  //乘除法选择
    cin>>m;
    cout<<"请计算并输出结果:"<<endl;
    for(i=0;i<number;i++)
    {    
        num1=rand()%value+1;
        num2=rand()%value+1;
        oper1=Operator(m);
        s_num1=num_str(num1);
        s_num2=num_str(num2);
        s_connect[i]=s_num1+oper1+s_num2;
        jishu=rand()%3+2;
        if(jishu>2)    //对随机生成运算式里数值个数判断
        {
            for(j=jishu;j>2;j--)     //两个数值以上运算式生成
            {
                s_num1=s_connect[i];
                oper1=Operator(m);
                num2=rand()%value+1;
                s_num2=num_str(num2);
                s_connect[i]=s_num1+oper1+s_num2;
            }
        }
        Calculator Ca;
        int L;
        double b;
        L=s_connect[i].length();
        int k;
        for(k=0;k<L;k++)
        {
            Ca.cal[i][k]=s_connect[i][k];
        }
        double a=Ca.Run(i,L);
        cout<<s_connect[i]<<"=";
        cin>>b;
        if(b==a)
        {
            cout<<"恭喜你,回答正确!"<<endl;
            n++;
        }
        else
        {
            cout<<"很遗憾,回答错误!"<<endl;
        }
    }
    cout<<"本次答题共答对"<<n<<"道题!"<<endl;
    return 0;
}