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#include<stdio.h>
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#include<string.h>
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#include<stdlib.h>
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#include<windows.h>
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#include<conio.h>
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typedef struct exam_system //定义链表
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{
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char problem[150];
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char answer[4][20];
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char right;
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char input;
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struct exam_system *next;
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}EXAM; //类型名自定义
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void management(); //题目管理函数
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void add(); //添加题目函数
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void show(); //遍历题库函数
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void preservation(); //保存文档函数
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void change(); //修改题目函数
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void exam(); //考试初始界面函数
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void link(); //创建链表函数
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void Answer(); //答题函数
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int sum; //题目总数
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struct exam_system *p1,*p2,*head;
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FILE *fp;
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int main()
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{
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link();
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system("color 75"); //自定义background
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exam();
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return 0;
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}
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void link() //创建链表
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{
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head=(EXAM *)malloc(sizeof(EXAM)); //创建头节点,并给予一个动态内存
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p2=p1=head; //连续赋值
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p1->next=NULL; //令p1指向末尾
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if((fp=fopen("D:\\exam.txt","r+"))==NULL)
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{
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printf("文件打开失败！！");
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exit(0);
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}
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while(1)
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{
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p1=(EXAM*)malloc(sizeof(EXAM));
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if(fread(p1,sizeof(EXAM),1,fp)==0) //读取信息
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break; //否则退出
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p2->next=p1; //与第一个节点连接
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p2=p1; //p1与p2同时指向新开辟的节点
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sum++;
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p2->next=NULL; //另p2指向末尾
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}
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fclose(fp);
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}
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void exam() //考试界面函数
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{
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int x;
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system("cls");
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printf("\t\t*********欢迎来到单项选择题考试系统*********\n");
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printf("\t\t* *\n");
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printf("\t\t* 1.题目管理 *\n");
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printf("\t\t* *\n");
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printf("\t\t* 2.开始考试 *\n");
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printf("\t\t* *\n");
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printf("\t\t* 3.退出 *\n");
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printf("\t\t* *\n");
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printf("\t\t********************************************\n");
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printf("\n");
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printf("请选择：");
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scanf("%d",&x);
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switch(x)
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{
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case 1:management();break;
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case 2:Answer();break;
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case 3:exit(0);break;
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default :printf("输入有误！\n");break;
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}
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}
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void management() //题目管理函数
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{
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int x;
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system("cls");
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printf("\t\t************欢迎来到题目管理系统************\n");
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printf("\t\t* *\n");
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printf("\t\t* 1.新增题目 *\n");
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printf("\t\t* *\n");
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printf("\t\t* 2.遍历题库 *\n");
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printf("\t\t* *\n");
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printf("\t\t* 3.修改题目 *\n");
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printf("\t\t* *\n");
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printf("\t\t* 4.返回上一级 *\n");
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printf("\t\t* *\n");
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printf("\t\t********************************************\n");
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printf("\n");
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printf("请选择：");
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scanf("%d",&x);
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switch(x)
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{
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case 1:add();management();break;
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case 2:show();management();break;
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case 3:change();management();break;
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case 4:;exam();break;
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default :printf("输入有误！\n");break;
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}
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}
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void preservation() //保存文档函数
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{
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EXAM *current=NULL;
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current=head->next;
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fp=fopen("D:\\exam.txt","w+");
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do
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{
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fwrite(current,sizeof(EXAM),1,fp); //逐个存储
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current=current->next; //当前指针指向下一个
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}while(current!=NULL); //直到指向末尾
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fclose(fp);
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printf("\n保存成功！！");
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getch();
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}
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void show() //遍历题库函数
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{
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int c,i;
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EXAM *p=NULL;
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system("cls");
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if(sum==0)
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{
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printf("题库中没有题目！\n");
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printf("按任意键继续！");
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getch();
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}
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else
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{
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p=head;
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i=0;
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do
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{
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p=p->next;
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printf("%d.%s\n",i+1,p->problem);
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c=0;
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while(c<4)
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{
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printf("%c:",c+'A');
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printf("%s\n",p->answer[c++] );
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}
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printf("正确答案:");
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printf("%c\n",p->right);
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i=i+1;
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printf("\n-------------------------------------------------------------\n");
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}while(p->next!=NULL);
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p=NULL;
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printf("按任意键继续！\n");
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getch();
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}
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}
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void add() //题目添加函数
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{
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int x,i;
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system("cls");
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printf("\t\t**************欢迎来到题目管理系统****************\n");
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do
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{
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p1=(EXAM *)malloc(sizeof(EXAM));
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p2->next=p1; //相连p1、p2
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p2=p1; //指向相同
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printf("请输入第%d个题目：",sum+1);
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scanf("%s",p1->problem);
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printf("请输入备选答案：\n");
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for(i=0;i<4;i)
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{
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printf("%c)",i+'A');
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scanf("%s",p1->answer[i++] );
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}
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printf("输入正确答案：");
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p1->right =getchar();
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scanf("%c",&p1->right );
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sum+=1;
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printf("\n");
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printf("\t是否继续添加\n\t1.继续\n\t2.退出\n请选择：");
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scanf("%d",&x);
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if(x==2)
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{
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p2->next=NULL;
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break;
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}
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system("cls");
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}while(x==1);
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preservation();
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}
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void change() //修改题目函数
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{
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int i,num;
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EXAM *p1=NULL;
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EXAM *p2=NULL;
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show();
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if(sum>=1)
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{
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p1=(EXAM *)malloc(sizeof(EXAM)); //为P1分配一个动态内存
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p2=head;
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printf("请选择修改的题目序号：");
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scanf("%d",&num);
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for(i=0;i<num-1;i++)
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{
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p2=p2->next;
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} //此时p2终于依次挪到num-1处
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printf("请输入题目：");
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scanf("%s",p1->problem);
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printf("请输入备选答案：\n");
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for(i=0;i<4;)
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{
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printf("%c:",i+'A');
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scanf("%s",p1->answer[i++] );
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}
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printf("输入正确答案：");
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p1->right=getchar();
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scanf("%c",&p1->right);
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p1->next=p2->next->next; //此时新节点将代替原节点
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p2->next=p1; //p1、p2连接
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p1=NULL;
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p2=NULL; //最后都置为末尾
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preservation();
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}
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}
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void Answer() //答题函数
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{
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int i,j,c;
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int n;
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int score=0;
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EXAM *p=NULL;
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printf("祝你考试顺利！！\n");
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system("cls");
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if(sum>0)
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{
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i=0;
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p=head;
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printf("请输入你需要的题量：");
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scanf("%d",&n);
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do
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{
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p=p->next; //更新指针，输出下一个结构体的数据
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printf("%d.%s\n",i+1,p->problem);
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c=0;
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while(c<4)
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{
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printf("%c:",c+'A');
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printf("%s\n",p->answer[c++] );
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}
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printf("请输入你的答案：");
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p->input=getchar();
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scanf("%c",&p->input);
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if(p->right==p->input)
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{
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printf("\n恭喜！！你的答案是 %c ，正确答案是 %c ",p->input,p->right);
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score+=1;
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}
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else
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{
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printf("\n太可惜了~你的答案是 %c ，正确答案是 %c ",p->input,p->right);
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}
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i=i+1;
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printf("\n----------------------------------------------------------\n");
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if(i==n)
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break;
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}while(p->next!=NULL);
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printf("考试结束!\n");
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printf("总题数：%d\n正确数：%d\n",n,score);
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getch();
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;
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}
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else
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printf("题库中没有题目!\n");
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printf("按任意键继续！\n");
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getchar();
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}
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