作业要求：1、实现在线答题。
2、答题结束后，可以判断对错。
3、并将错题的结果保存起来。
代码
#include<iostream>
#include<stdarg.h>
#include<stdlib.h>
#include<time.h>
#include<math.h>
using namespace std;
int main()
{
cout<<endl;
cout<<"欢迎使用四则运算小程序"<<endl;
cout<<endl;
cout<<endl;
Again:
double Q1=1;
int Q01;
int Q2=1;
int Q3=100;
char Q4='y';
int Q5=1;
char Q6='n';
char Q7='n';
double ans=0;
int right=0;
cout<<" 一.请输入题目数量：";
cin>>Q1;
Q01=floor(Q1);
// cout<<"请输入每行打印题目数（1-5）：";
// cin>>Q2;
cout<<" 二.行间距(正整数)：";
cin>>Q5;
cout<<" 三.请输入算式中数值的最大值：";
cin>>Q3;
while(1)
{
cout<<" 四.运算中需要乘除法吗？需要：y；不需要：n";
cin>>Q4;
cout<<" 五.减法中需要有负数吗？需要y：；不需要：n";
cin>>Q7;
cout<<"`````````````````````````````````````````````````````````````````````````"<<endl;
cout<<"开始答题："<<endl;
srand(time(NULL));
if(Q4=='y')
{
while(1)
{
if(Q1<1)
{
cout<<"输入有误，请重新输入题目数量:";
cin>>Q1;
Q01=floor(Q1);
}
else
{
for(int j=0;j<Q01;j++)
{
if(j!=0&&j%Q2==0)
{
for(int i=0;i<Q5;i++)
{
cout<<endl;
}
}
int num1=rand()%Q3;
int num2=rand()%Q3;
int sign=rand()%4;
switch(sign)
{
case 0:
cout<<j+1<<":"<<" "<<num1<<"+"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1+num2)
{
cout<<"正确"<<endl;
right++;
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num1+num2<<endl;
}
break;
case 1:
if(Q7=='y')
{
cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1-num2)
{
cout<<"正确"<<endl;
right++;
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num1-num2<<endl;
}
}
else
{
if(num1>num2)
{
cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1-num2)
{
cout<<"正确"<<endl;
right++;
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num1-num2<<endl;
}
}
else
{
cout<<j+1<<":"<<" "<<num2<<"-"<<num1<<"="<<"\t";
cin>>ans;
if(ans==num2-num1)
{
cout<<"正确"<<endl;
right++;
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num2-num1<<endl;
}
}
}
break;
case 2:
cout<<j+1<<":"<<" "<<num1<<"*"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1*num2)
{
cout<<"正确"<<endl;
right++;
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num1*num2<<endl;
}
break;
case 3:
if(num2!=0)
{
cout<<j+1<<":"<<" "<<num1<<"/"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1/num2)
{
cout<<"正确"<<endl;
right++;
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num1/num2<<endl;
}
}
else
{
j--;
}
break;
}
}
break;
}
}
cout<<"共答对"<<right<<"道题；"<<"答错"<<Q01-right<<"道题。";
cout<<"继续努力！"<<endl;
break;
}
if(Q4=='n')
{
while(1)
{
if(Q01<1)
{
cout<<"输入有误，请重新输入题目数量:";
cin>>Q1;
Q01=floor(Q1);
}
else
{
for(int j=0;j<Q01;j++)
{
if(j!=0&&j%Q2==0)
{
for(int i=0;i<=Q5;i++)
{
cout<<endl;
}
}
int num1=rand()%Q3;
int num2=rand()%Q3;
int sign=rand()%2;
switch(sign)
{
case 0:
cout<<j+1<<":"<<" "<<num1<<"+"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1+num2)
{
cout<<"正确"<<endl;
right++;
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num1+num2<<endl;
}
break;
case 1:
if(Q7=='y')
{
cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1-num2)
{
cout<<"正确"<<endl;
right++;
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num1-num2<<endl;
}
break;
}
else
{
if(num1>num2)
{
cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1-num2)
{
cout<<"正确"<<endl;
right++;
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num1-num2<<endl;
}
break;
}
else
{
cout<<j+1<<":"<<" "<<num2<<"-"<<num1<<"="<<"\t";
cin>>ans;
if(ans==num2-num1)
{
cout<<"正确";
}
else
{
cout<<"答错了！"<<endl;
cout<<"正确答案是："<<num2-num1<<endl;
}
break;
}
}
break;
}
}
}
break;
}
cout<<"共答对"<<right<<"道题；"<<"答错"<<Q01-right<<"道题。"<<endl;
cout<<"继续努力！"<<endl;
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>>Q6;
if(Q6=='y')
{
goto Again;
}
if(Q6=='n')
{
goto Exit;
}
else
{
cout<<"输入有误，请重新输入：";
}
}
Exit:
return 0;
}
心得，太困难，一点头绪没有！从网上搜索的代码，然后加以学习，认识。
一定在C语言上，更加的努力学习