一个小学生练习题 能实现基本的加减乘除

设计一个程序，用来实现帮助小学生进行算术运算练习，它具有以下功能：（1） 提供10道加、减、乘、除四种基本算术运算的题目，每道题中的操作数是随机产生的；（2） 加减是100以内的数；乘除为乘法表里的；被减数大于减数；除法要求能整除；被乘数小与乘数；（若不合格重新产生）（3） 练习者根据显示的题目输入自己的答案，程序自动判断输入的答案是否正确并显示出相应的信息。最后显示做对了几道题；（4） 每次答题要记录做错的题目，下次做题可选择上次做错的题；

#include<iostream>#include<stdio.h>#include<cstdlib>#include<time.h>#define N 10using namespace std;struct math{int i;int a,b;char op;int result;int ans;bool test;struct math *next;};struct math *creat(){	int j;struct math *head, *p1, *p2;srand(time(0));head=p2=(struct math *)malloc(sizeof(struct math));for(int i=0; i<N; i++){j=rand()%4;p1=(struct math *)malloc(sizeof(struct math));switch(j){case 1: p1->op='+';p1->a=rand()%100;p1->b=rand()%100;p1->result=p1->a+p1->b;break;case 2: p1->op='-';p1->a=rand()%100;p1->b=rand()%100;while(p1->a<p1->b)p1->a=rand()%100;p1->result=p1->a-p1->b;break;case 3: p1->op='x';p1->a=rand()%10;p1->b=rand()%10;while(p1->a<p1->b)p1->a=rand()%10;p1->result=p1->a*p1->b;break;default : p1->op='/';p1->b=rand()%10;p1->a=(rand()%10)*p1->b;p1->result=p1->a/p1->b;break;}p2->next=p1;p2=p1;}p1->next=NULL;return head;}void baocun(struct math *head){FILE *fp;struct math *p;p=head->next;if((fp=fopen("tian.txt","w"))==NULL){cout<<"open error"<<endl;exit(0);}elsewhile(p!=NULL){if(fwrite(p,sizeof(struct math),1,fp)!=1)printf("error\n");elsep=p->next;}//printf("保存成功！\n");fclose (fp);}struct math *read (struct math *head){FILE *fp;struct math *p1,*p2;if((fp=fopen("tian.txt","r"))==NULL){printf("tttttttttttttttttttt\n");printf("error\n");exit (0);}p2=head=(struct math *)malloc(sizeof(struct math));p1=(struct math *)malloc(sizeof(struct math));head->next=p1;while(fread(p1,sizeof(struct math),1,fp)==1){p2->next=p1;p2=p1;p1=(struct math *)malloc(sizeof (struct math));}p1->next=NULL;fclose(fp);return head;}void test(){struct math *p,*head;int i=1;int x;int count=0;cin>>x;switch(x){case 1: head=creat();p=head->next;while(p!=NULL){p->i=i;cout<<"第"<<p->i<<"道题:"<<p->a<<p->op<<p->b<<"=";cin>>p->ans;if(p->ans==p->result){cout<<"正确！"<<endl;count++;p->test=true;}else{cout<<"错误！"<<endl;p->test=false;}p=p->next;i++;}cout<<N<<"道题做对了"<<count<<"道"<<endl;baocun(head);break;case 2:head=read(head);p=head->next;while(p!=NULL){if(p->test==false){cout<<"第"<<p->i<<"道题:"<<p->a<<p->op<<p->b<<"=";cin>>p->ans;if(p->ans==p->result){cout<<"正确！"<<endl;p->test=true;}else{cout<<"错误！"<<endl;p->test=false;count++;}}p=p->next;}if(count==0){cout<<"全部都答对了!"<<endl;}elsecout<<"还有"<< count<<"道没答对"<<endl;baocun(head);break;case 3: exit(0);}}void menu(){cout<<" 小学生练习题"<<endl;cout<<"1. 开始练习"<<endl;cout<<"2. 练习错题"<<endl;cout<<"3. 退出程序"<<endl;cout<<"选择执行的命令"<<endl;}int main(){while(1){menu();test();}return 0;}

运行主界面为可以随机产生十道题，做错的题目可以下次通过练习错题来继续做。