要求编写一个小学数学出题系统,之前都编写好了...可是要求写到要有题目存储功能...然后就不会了,这个不会啊,有人能帮我一下么?
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<time.h>
#define r100 rand()%NN
#define r4 rand()%4
#define r50 rand()%(NN/2)
int main()
{
    int a,b,c,i,j,aa[25]={1};
    int ans,s,k=0,hour,mini,sec,NN,MM;
    double score=0.0;
    clock_t start,end;
    char ch[4][4]={"＋","－","×","÷"},ag;
    srand((unsigned)time(NULL));
    for(i=1;i<6;i++)printf("\n");
    printf("     ####################################################################\n");
    printf("     ####******************适用于小学3年级以下***********************####\n");
    printf("     ####********************Ready, Go,Go,Go！***********************####\n");
    printf("     ####***好好学习****小学数学（+ - * /）练习系统！***天天向上*****####\n");
    printf("     ####****************************Day Day Up!*********************####\n");
    printf("     ####################################################################\n");
    system("pause");
   
begin: k=0;score=0;
       printf("请输入测验数字大小范围（100表示100以内）：");
       scanf("%d",&NN);
       printf("\n");
       printf("请输入测验题目数量：");
       scanf("%d",&MM);
       printf(">>>>>>>>>>>>>>你将要进行%d以内测验,题数：%d题！<<<<<<<<<<<<<<<<<<<<<<\n",NN,MM);
       system("pause");
    system("cls");
    for(i=1;i<6;i++)printf("\n");
    printf("     ####################################################################\n");
    printf("     ####*************************准备好了么？？*********************####\n");
    printf("     ####************************Ready, Go,Go,Go！*******************####\n");
    printf("     ####********好好学习*********Good good Study！*****天天向上*****####\n");
    printf("     ####****************************Day Day Up!*********************####\n");
    printf("     ##################################开始啦！##########################\n");
    system("pause");

    start=clock();
    do {
        k++;
        a=r100;
        b=r100;
        c=r4;
        if(3==c)
        { aa[1]=a;
           for(i=2,j=2;i<=a/2;i++)
               if(a%i==0){aa[j]=i;j++;}
           do b=aa[rand()%j];
           while(b==0);
           }
        if(1==c)b=rand()%a;
        if(2==c){a=r50;b=rand()%(NN/a);}
        if(0==c)b=rand()%(NN-a);
        switch(c){
                  case 0:s=a+b;break;
                  case 1:s=a-b;break;
                  case 2:s=a*b;break;
                  case 3:s=a/b;break;
                  }
        printf("(%d). %d %s %d =",k,a,ch[c],b);
        scanf("%d",&ans);
        if(ans==s)printf("（√）得分：%.2f\n",score+=100.0/MM);
        else printf("（×）正确答案为：%d\n得分：%.2f\n",s,score);
        }
    while(k<MM);
    end=clock();
    hour=0;
    mini=0;
    sec=(end-start)/1000;
    if(sec>59)
       {
              if(sec>=3600){hour=sec/3600;mini=(sec-hour*3600)/60;sec=sec%60;}
              else {hour=0;mini=sec/60;sec=sec%60;}
              }
    printf("总用时：%d小时%d分%d秒\n总得分：%.2f\n",hour,mini,sec,score);
    if(score-60.0<0){
                 printf("你很聪明，不过基础太差，你还需要努力噢，加油！加油！加油！");
                 printf("不服,再来一遍？(Y/N):") ;
                 fflush(stdin);
                 ag=getchar();
                 if(ag=='Y'||ag=='y')goto begin;
                 }
    system("pause");
    fflush(stdin);
    printf("是否再来一遍？(Y/N):");
    ag=getchar();
    if(ag=='Y'||ag=='y')goto begin;
    return 0;
}

楼主，这是课程设计的作业吧？

创建一个文件，把题目写进文件就可以了。