要求：

1.實現在線答題；

2.答題結束後，可以判斷對錯；

3.將錯的題保存起來；

#include<iostream>
#include<stdarg.h>
#include<stdlib.h>
#include<time.h>
#include<math.h>
using namespace std;
int main()
{
cout<<endl;
cout<<"歡迎來到小學生四則運算在線答題系統"<<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<<" 輸入題目數量：";
cin>>Q1;
Q01=floor(Q1);
while(1)
{
cout<<" 減法中需要有負數嗎？需要: 1；不需要：2";
cin>>Q7;
cout<<"-------------------------------------------------------------------------
 
"<<endl;
cout<<"開始進行答題："<<endl;
srand(time(NULL));
if(Q4==‘y‘)
{
while(1)
{
if(Q1<1)
{
cout<<"輸入有誤，請重新輸入題目數量:";
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<<"正確"<<endl;
right++;
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num1+num2<<endl;
}
break;
case 1:
if(Q7==‘y‘)
{
cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1-num2)
{
cout<<"正確"<<endl;
right++;
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num1-num2<<endl;
}
}
else
{
if(num1>num2)
{
cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1-num2)
{
cout<<"正確"<<endl;
right++;
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num1-num2<<endl;
}
}
else
{
cout<<j+1<<":"<<" "<<num2<<"-"<<num1<<"="<<"\t";
cin>>ans;
if(ans==num2-num1)
{
cout<<"正確"<<endl;
right++;
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num2-num1<<endl;
}
}
}
break;
case 2:
cout<<j+1<<":"<<" "<<num1<<"*"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1*num2)
{
cout<<"正確"<<endl;
right++;
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num1*num2<<endl;
}
break;
case 3:
if(num2!=0)
{
cout<<j+1<<":"<<" "<<num1<<"/"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1/num2)
{
cout<<"正確"<<endl;
right++;
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num1/num2<<endl;
}
}
else
{
j--;
}
break;
}
}
break;
}
}
cout<<"共答對"<<right<<"道題；"<<"答錯"<<Q01-right<<"道題。";
break;
}
if(Q4==‘n‘)
{
while(1)
{
if(Q01<1)
{
cout<<"輸入有誤，請重新輸入題目數量:";
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<<"正確"<<endl;
right++;
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num1+num2<<endl;
}
break;
case 1:
if(Q7==‘y‘)
{
cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1-num2)
{
cout<<"正確"<<endl;
right++;
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num1-num2<<endl;
}
break;
}
else
{
if(num1>num2)
{
cout<<j+1<<":"<<" "<<num1<<"-"<<num2<<"="<<"\t";
cin>>ans;
if(ans==num1-num2)
{
cout<<"正確"<<endl;
right++;
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num1-num2<<endl;
}
break;
}
else
{
cout<<j+1<<":"<<" "<<num2<<"-"<<num1<<"="<<"\t";
cin>>ans;
if(ans==num2-num1)
{
cout<<"正確";
}
else
{
cout<<"答錯了！"<<endl;
cout<<"正確答案是："<<num2-num1<<endl;
}
break;
}
}
break;
}
}
}
break;
}
cout<<"共答對"<<right<<"道題；"<<"答錯"<<Q01-right<<"道題。"<<endl;
break;
}
else
{
cout<<"輸入有誤,請按要求輸入!"<<endl;
}
}
cout<<endl;
while(1)
{
cout<<"是否繼續？(y：繼續；n：退出)";
cin>>Q6;
if(Q6==‘y‘)
{
goto Again;
}
if(Q6==‘n‘)
{
goto Exit;
}
else
{
cout<<"輸入有誤，請重新輸入：";
}
}
Exit:
return 0;
}

個人總結：這次編程難度較大，主要學習到了if語句的多重利用，如何記錄錯題，確實想不到有效的解決方法。

個人項目：二柱子加強版