程序为什么不能运行，如何使其运行？

Question

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
typedef struct Exam
{
    char question[1024];
    char A[100];
    char B[100];
    char C[100];
    char D[100];
    char correct;
}Exam;

Exam questions[1000];
int count;

void load_question()
{
   char *p;
   FILE *fp;
   char buf[1024];
   count=0;
   if((fp=fopen("questions.txt","r"))==NULL)
   {
     return ;
   }
   while(1)
   {
       if(fgets(buf,1024,fp)==NULL)
       {
       break;
       }
       else
       {
           p=strtok(buf,"\t");
           strcpy(questions[count].question, p);
           p=strtok(NULL, "\t");
           strcpy(questions[count],A, p);
           p=strtok(NULL, "\t");
           strcpy(questions[count].B, p);
           p=strtok(NULL, "\t");
           strcpy(questions[count].C, p);
           p=strtok(NULL, "\t");
           strcpy(questions[count].D, p);
           p=strtok(NULL, "\t");
           questions[count].correct= p[0];
           count++;
   }
     fclose(fp);
}

void save_question()
{
    FILE *fp=fopen("questions.txt", "w");
    int i;
    for(i=0;i<count;i++)
    {
        fprintf(fp，"%5\t%5\t%5\t%5\t%5\t%c\n", questions[i].question,questions[i].A,questions[i].B, questions[i].C,questions[i].D,questions[i].correct);
    }
    fclose(fp);
}

void input_question()
{
    char buf[1024];
    printf("请输入题目:")；
    gets(questions[count].question);
    fflush(stdin);

    printf("请输入选项 A:")；
    gets(questions[count].A);
    fflush(stdin);

    printf("请输入选项 B:");
    gets(questions[count].B);
    fflush(stdin);

    printf("请输入选项 C:");
    gets(questions[count].C);
    fflush(stdin);

    printf("请输入选项 D:");
    gets(questions[count].D);
    fflush(stdin);

    printf("请输入正确答案:")；
   questions[count].correct = getchar();
   fflush(stdin);

   count++;
   printf("录入试题成功!");
   getch();
}
void start_test()
{
    int n;
    int k=0;
    int j;
    int i;
    int p;
    int score=0;
    int index;
    char q;
    printf("请输入题目数:");
    scanf("%d",&n);
    fflush(stdin);
    while(n>count)
    {
        printf("试题库不足%d 个题\n",n);
        printf("请从新输入题目数:\n");
        scanf("%d",&n);
        fflush(stdin);
    }
   p = (int *)malloc(n*sizeof(int));
   for(i=0;i<n;i++)
   {
       int index=rand()%count;
       for(j=0;j<k;j++)
       {
           if(index==p[j])
           {
               i--;
               break;
           }
       }
       if(j==k)
       {
           p[k++]=index;
       }
   }
   for(i=0;i<n;i++)
   {
       index = p[i];
       printf("第%d 个题:%s\n",i+1,questions[index].question);
       printf("A.%s\tB.%s\tC.%s\tD.%s\n",questions[index].A,questions[index].B,questions[index].C,questions[index].D);
       printf("请输入您的答案:")
       scanf("%c",&q);
       fflush(stdin);
       if(q==questions[index].correct)
       {
           score++;
       }
       else
       {
           printf("答案错误，正确答案是:%c\n",questions[index].correct);
       }
   }
   printf("答题结束，您一共答了%d道题,其中答对了%d道\n",n,score);
   getch();
   return;
}

void show()
{
    int i;
    for(i=0;i<count;i++)
    {
        printf("***********************************************************************\n");
        printf("第%d个题：%s\n",i+1,questions[i].question);
        printf("A.%s\tB.%s\tC.%s\t%s\n",questions[i].A,questions[i].B,questions[i].C,questions[i].D);
        printf("***********************************************************************\n);
    }
       getch();
}

int menu()
{
    int s;
    printf("***************************************************************************\n");
    printf("*                    单线选择题考试系统                                   *\n");
    printf("*                                                                         *\n");
    printf("*                         1.试题录入                                      *\n");
    printf("*                                                                         *\n");
    printf("*                         2.试题浏览                                      *\n");
    printf("*                                                                         *\n");
    printf("*                         3.试题追加                                      *\n");
    printf("*                                                                         *\n");
    printf("*                         4.试题抽取                                      *\n");
    printf("*                                                                         *\n");
    printf("*                         5.答    题                                      *\n");
    printf("*                                                                         *\n");
    printf("*                         6.退出系统                                      *\n");
    printf("*                                                                         *\n");
    printf("*                                                                         *\n");
    printf("***************************************************************************\n");
    scanf("%d",&s);
    flush(stdin);
    return s;
}

int main()
{
    int n;
     while(1)
     {
         system("cls");
         n=menu();
         switch(n)
         {
         case 1:load_question();break;
         case 2:show();break;      
         case 3:input_question();break;    
         case 4:start_test();break;
         case 5:save_question();exit;
         case 6:exit(0);
         default:printf("错误\n");
         }
   
}

Answer 1

把代码发一下，方便调试。