void main(){
          char bu[99]={0},a[]="a.txt",*ck,st[5]={0};
          int j=-1,k,an,t;
          puts("a to z?");
          scanf("%c",a);
          FILE *fp=fopen(a,"r");
          if(!fp){puts("File not found");return;}
          while(EOF!=fscanf(fp,"%s",bu)){
                    word=(s1*)realloc(word,sizeof(s1)*(i+1));
                    word[i].a=(char*)calloc(strlen(bu),sizeof(char));
                    strcpy(word[i].a,bu);
                    fscanf(fp,"%s",bu);
                    word[i].b=(char*)calloc(strlen(bu),sizeof(char));
                    strcpy(word[i++].b,bu);
          };
          ck=(char*)calloc(i,sizeof(char));
          while(++j<i){
                    system("cls");
                    printf("진행 %d/%d\\n",j+1,i);
                    printf("%s?\\n",word[j].a);
                    an=rand()%4+1;
                    for(k=1;k<5;k++){
                              printf("(%d) ",k);
                              if(an-k) while(ck[t=rand()%i]||t==j);
                              else t=j;
                              ck[st[k]=t]=1;
                              puts(word[t].b);
                    }
                    while(getch()-48-an) putchar(\'\\a\');
                    while(--k) ck[st[k]]=0;
          }
}

난 아이디어가 모자라는거 같아, 어느걸 추가/삭제 하면 좋을까요?
입문서 범위내코딩할수 있는거로 추천바람