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grade3and4_final.cpp
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#include<stdio.h>
#include<bits/stdc++.h>
#include <time.h>
#include <unistd.h>
using namespace std;
int grade3_4()
{
int number; //number为题目数目
srand(time(NULL));
float result,ans;
int op;
cin>>number;
for(int i=0;i<number;i++){
int ele_num=rand()%2+2; //ele_num为该题元素个数
if(ele_num==2){
int a=rand()%10001;
int b=rand()%10001;
op=rand()%4;
switch(op)
{
case 0:
cout<<a<<"+"<<b<<"="<<endl;
result=a+b;
cin>>ans;
if(ans!=result)flag++;
break;
case 1:
cout<<a<<"-"<<b<<"="<<endl;
result=a-b;
cin>>ans;
if(ans!=result)flag++;
break;
case 2:
cout<<a<<"*"<<b<<"="<<endl;
result=a*b;
cin>>ans;
if(ans!=result)flag++;
break;
case 3:
cout<<a<<"/"<<b<<"="<<endl;
result=a/b;
cin>>ans;
if(ans!=result)flag++;
break;
}
}
else{ //ele_num=3;
int a=rand()%10001;
int b=rand()%10001;
int c=rand()%10001;
op=rand()%20;
switch(op)
{
case 1:
cout<<a<<"+"<<b<<"-"<<c<<"="<<endl;
result=a+b-c;
cin>>ans;
if(ans!=result)flag++;
break;
case 2:
cout<<a<<"+"<<b<<"+"<<c<<"="<<endl;
result=a+b+c;
cin>>ans;
if(ans!=result)flag++;
break;
case 3:
cout<<a<<"+"<<b<<"="<<endl;
result=a+b*c;
cin>>ans;
if(ans!=result)flag++;
break;
case 4:
cout<<a<<"+"<<b<<"="<<endl;
result=a+b/c;
cin>>ans;
if(ans!=result)flag++; //+
break;
case 5:
cout<<a<<"-"<<b<<"-"<<c<<"="<<endl;
result=a-b-c;
cin>>ans;
if(ans!=result)flag++;
break;
case 6:
cout<<a<<"-"<<b<<"+"<<c<<"="<<endl;
result=a-b+c;
cin>>ans;
if(ans!=result)flag++;
break;
case 7:
cout<<a<<"-"<<b<<"*"<<c<<"="<<endl;
result=a-b*c;
cin>>ans;
if(ans!=result)flag++;
break;
case 8:
cout<<a<<"-"<<b<<"/"<<c<<"="<<endl;
result=a-b/c;
cin>>ans;
if(ans!=result)flag++;
break;
case 9:
cout<<a<<"*"<<b<<"-"<<c<<"="<<endl;
result=a*b-c;
cin>>ans;
if(ans!=result)flag++;
break;
case 10:
cout<<a<<"*"<<b<<"+"<<c<<"="<<endl;
result=a*b+c;
cin>>ans;
if(ans!=result)flag++;
break;
case 11:
cout<<"("<<a<<"+"<<b<<")"<<"*"<<c<<"="<<endl; //括号开始
result=(a+b)*c;
cin>>ans;
if(ans!=result)flag++;
break;
case 12:
cout<<"("<<a<<"-"<<b<<")"<<"-"<<c<<"="<<endl;
result=(a-b)*c;
cin>>ans;
if(ans!=result)flag++;
break;
case 13:
cout<<"("<<a<<"+"<<b<<")"<<"/"<<c<<"="<<endl;
result=(a+b)/c;
cin>>ans;
if(ans!=result)flag++;
break;
case 14:
cout<<"("<<a<<"-"<<b<<")"<<"/"<<c<<"="<<endl;
result=(a-b)*c;
cin>>ans;
if(ans!=result)flag++;
break;
case 15:
cout<<a<<"*"<<"("<<b<<"+"<<c<<")"<<"="<<endl;
result=a*(b+c);
cin>>ans;
if(ans!=result)flag++;
break;
case 16:
cout<<a<<"*"<<"("<<b<<"-"<<c<<")"<<"="<<endl;
result=a*(b-c);
cin>>ans;
if(ans!=result)flag++;
break;
case 17:
cout<<a<<"/"<<"("<<b<<"+"<<c<<")"<<"="<<endl;
result=a/(b+c);
cin>>ans;
if(ans!=result)flag++;
break;
case 18:
cout<<a<<"/"<<"("<<b<<"-"<<c<<")"<<"="<<endl;
result=a/(b-c);
cin>>ans;
if(ans!=result)flag++;
break;
case 19:
cout<<a<<"-"<<"("<<b<<"+"<<c<<")"<<"="<<endl;
result=a-(b+c);
cin>>ans;
if(ans!=result)flag++;
break;
case 20:
cout<<a<<"-"<<"("<<b<<"-"<<c<<")"<<"="<<endl;
result=a-(b-c);
cin>>ans;
if(ans!=result)flag++;
break;
}
}
}
return flag;
}