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#include<stdio.h>
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#include<stdlib.h>
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#include<string.h>
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#include<time.h>
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#define M 100
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void dele(){
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typedef struct question{
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char mainq[500];
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char ala[150];
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char alb[150];
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char alc[150];
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char ald[150];
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char ans;
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}ques;
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char _m[20]="password";
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char _n[20];
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int z=3;
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while(z--)
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{
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printf("你还有%d次机会输入管理员密码：",z+1);
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scanf("%s",_n);
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printf("\n");
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if(strcmp(_m,_n)==0)
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{
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FILE *fp,*fp2;
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int flag=0,n,jud,i;
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system("cls");
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char q[500];
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ques que[M];
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fp=fopen("question.dat","ab+");
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if(fp==NULL)
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{
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printf("文件处理失败");
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return ;
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}
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jud=flag=0;
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printf("请输入您想删除的试题的完整题干：\n");
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scanf("%s",q);
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for(i=0;fread(&que[i],sizeof(ques),1,fp)==1;i++)
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{
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if(strcmp(q,que[i].mainq)==0)
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{
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printf("该题目前状态如下：\n");
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printf("%s\n",que[i].mainq);
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printf("A.%s\n",que[i].ala);
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printf("B.%s\n",que[i].alb);
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printf("C.%s\n",que[i].alc);
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printf("D.%s\n",que[i].ald);
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printf("正确选项：%c\n",que[i].ans);
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flag=1;
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fclose(fp);
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fp2=fopen("que2.dat","wb");
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fp=fopen("question.dat","rb");
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break;
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}
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}
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if(flag)
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{
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for(i=0;fread(&que[i],sizeof(ques),1,fp)==1;i++){
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if(strcmp(q,que[i].mainq)!=0)
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fwrite(&que[i],sizeof(ques),1,fp2);}//把除要删除的试题外的所有试题复制给另外一个文件，再把另外一个文件复制回来
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fclose(fp);
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fclose(fp2);
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fp=fopen("question.dat","wb");
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fp2=fopen("que2.dat","rb");
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for(i=0;fread(&que[i],sizeof(ques),1,fp2)==1;)
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{
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fwrite(&que[i],sizeof(ques),1,fp);
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i++;
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}
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fclose(fp);
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fclose(fp2);
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printf("\t\t\t\t成功删除该试题");
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}
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else
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{
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fclose(fp);
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printf("\t\t\t\t未找到该试题");
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}
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break;
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}
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}
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return ;
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}
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