二柱子疑难杂症3

程序：

// 二柱子在线答题.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include<iostream>
#include<stdlib.h>
#include<time.h>
using namespace std;
void boom()
{
  
    float x,y;
    int z,t; 
    int first_num,second_num,third_num,fourth_num;
    srand(time(NULL));
    int n;
    float k;
    float d;
    float daan[100];
    int zq=0;
    int cw=0;
    cout<<"需要列出多少到数学题?"<<endl;
    cin>>n; 
    cout<<"********************************"<<endl;
    for(int i=0;i<n;i++)
    {
        z=rand()%4;
        first_num=rand()%10;
        second_num=rand()%10;
        third_num=rand()%10;
        fourth_num=rand()%10;
        while (second_num==0)
        {
            second_num=rand()%10;
         }
        if(first_num==0)
            first_num++;
        if(first_num==second_num)
             second_num++;
        if(first_num>second_num)
        {
            t=first_num;
            first_num=second_num;
            second_num=t; 
         }
    
        x=(float)first_num/second_num;
        while (fourth_num==0)
        {
            fourth_num=rand()%10;
         }
        if(third_num==0)
            third_num++;
        if(third_num==fourth_num)
            fourth_num++;
        if(third_num>fourth_num)
        {
            t=third_num;
            third_num=fourth_num;
            fourth_num=t; 
         }
        y=(float)third_num/fourth_num;
        z=rand()%4;
        switch(z)
        {
        case 0:
        cout<<i+1<<"、 ("<<first_num<<"/"<<second_num<<")+("<<third_num<<"/"<<fourth_num<<")=\t"<<" ";
        daan[i+1]=x+y;
        daan[i+1] = ( (float)( (int)( (daan[i+1] + 0.005) * 100 ) ) ) / 100;
        break;
        case 1:
        cout<<i+1<<"、 ("<<first_num<<"/"<<second_num<<")-("<<third_num<<"/"<<fourth_num<<")=\t"<<" "; 
        daan[i+1]=x-y;
        daan[i+1] = ( (float)( (int)( (daan[i+1] + 0.005) * 100 ) ) ) / 100;
        break;
        case 2:
        cout<<i+1<<"、 ("<<first_num<<"/"<<second_num<<")*("<<third_num<<"/"<<fourth_num<<")=\t"<<" ";
        daan[i+1]=x*y;
        daan[i+1] = ( (float)( (int)( (daan[i+1] + 0.005) * 100 ) ) ) / 100;
        break;
        case 3:
        if(y!=0)
        {
            cout<<i+1<<"、 ("<<first_num<<"/"<<second_num<<")÷("<<third_num<<"/"<<fourth_num<<")=\t"<<" ";
        }
        else
        {
            i=i-1;
        }
        daan[i+1]=(float)x/y;
        daan[i+1] = ( (float)( (int)( (daan[i+1] + 0.005) * 100 ) ) ) / 100;
        break;
        if((i+1)%3==0)
        {
            for(int c=0;c<=1;c++)
            {
                cout<<endl;
            }
        }
        if((i+1)==n)
        {
            cout<<endl;
        }
        }
        for(int i=1;i<=n;i++)
        {
            cout<<"请作答，结果保留两位小数:"<<endl;
            cout<<i<<"、";
            cin>>d;
            if(d==daan[i])
            {
                cout<<"恭喜您，回答正确！"<<endl;
                cout<<endl;
                zq=zq+1;
             }
            else
            {
                cout<<"回答错误，正确答案为："<<" "<<daan[i]<<endl;
                cout<<endl;
                cw=cw+1;
            }
          }
        k=(float)zq/n;
        cout<<"回答正确的数量为："<<" "<<zq<<"个"<<endl;
        cout<<"回答错误的数量为："<<" "<<cw<<"个"<<endl
        cout<<"正确率为："<<" "<<k<<endl;
}
int _tmain(int argc, _TCHAR* argv[])
{
    boom(); 
    int c;
    cout<<"要继续答题吗？（0：继续 1：退出）"<<endl;
    cin>>c;
    if(c==0)
    {
        cout<<endl;
    }
    else
    {
        cout<<endl;
        return 0;
    }
    return 0;
}