#include<iostream>
#include<stdlib.h>
#include<time.h>
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;std::cout<<"需要列出几道数学题?"<<std::endl;std::cin>>n;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;if (second_num==1){x=(float)first_num;}else if(first_num>second_num){t=first_num;first_num=second_num;second_num=t;}x=(float)first_num/second_num;if (fourth_num==1){y=(float)third_num;}else 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:std::cout<<i+1<<"、 "<<first_num<<"/"<<second_num<<"+"<<third_num<<"/"<<fourth_num<<"="<<"     ";daan[i+1]=x+y;break;case 1:std::cout<<i+1<<"、 "<<first_num<<"/"<<second_num<<"-"<<third_num<<"/"<<fourth_num<<"="<<"     ";daan[i+1]=x-y;break;case 2:std::cout<<i+1<<"、 "<<first_num<<"/"<<second_num<<"*"<<third_num<<"/"<<fourth_num<<"="<<"     ";daan[i+1]=x*y;break;case 3:if(y!=0){std::cout<<i+1<<"、 "<<first_num<<"/"<<second_num<<"÷"<<third_num<<"/"<<fourth_num<<"="<<"     ";}else{i=i-1;}daan[i+1]=(float)x/y;break;}if((i+1)%3==0){for(int c=0;c<=1;c++){std::cout<<std::endl;}}}for(int i=1;i<=n;i++){std::cout<<"请作答:"<<std::endl;std::cout<<i<<"、";std::cin>>d;if(d==daan[i]){std::cout<<"回答正确"<<std::endl;std::cout<<std::endl;zq=zq+1;}else{std::cout<<"回答错误，正确答案为："<<"  "<<daan[i]<<std::endl;std::cout<<std::endl;cw=cw+1;}}k=(float)zq/n;std::cout<<"回答正确的数量为："<<" "<<zq<<"个"<<std::endl;std::cout<<"回答错误的数量为："<<" "<<cw<<"个"<<std::endl;std::cout<<"正确率为："<<" "<<k<<std::endl;
}
int main()
{boom();int c;std::cout<<"要继续答题吗？（0：继续  1：退出）"<<std::endl;std::cin>>c;if(c==0){std::cout<<std::endl;main();}else{std::cout<<std::endl;return 0;}return 0;
}