Lập trình C : Nhập vào một số trong khoảng từ 0 đến 1000 và viết ra thành chữ,nếu nhập sai thì cho nhập lại

#include "stdio.h"

#include "conio.h"

void main()

{

       int n, tram;

menu:

       {

              printf("\nNhap vao so can viet ra chu :");

              scanf_s("%d", &n);

              if (n > 100 && n < 1000)

              {

                     tram = n / 100;

                     n = n % 100;

                     switch (tram)

                     {

                     case 1: printf("\n mot tram "); goto menu2;

                     case 2: printf("\n hai tram "); goto menu2;

                     case 3: printf("\n ba tram "); goto menu2;

                     case 4: printf("\n bon tram "); goto menu2;

                     case 5: printf("\n nam tram "); goto menu2;

                     case 6: printf("\n sau tram "); goto menu2;

                     case 7: printf("\n bay tram ");  gotomenu2;

                     case 8: printf("\n tam tram "); goto menu2;

                     case 9: printf("\n chin tram "); goto menu2;

                     }

              }

              else

              {

                     if (n == 100) { printf("mot tram \n"); goto menu; }

                     if (n == 1000) { printf("mot nghin \n"); goto menu; }

                    

              }

              if(n<0||n>1000) {

                     printf("\n Ban nhap sai roi phai nhap so trong khoang tu 0 den 1000 \n Moi nhap lai");

                     goto menu;

              }

       menu1:

              {

                     if (n <= 10)

                           switch (n)

                           {

                           case 0: printf("khong\n"); goto menu;

                           case 1:printf(" mot\n"); goto menu;

                           case 2:printf(" hai\n"); goto menu;

                           case 3:printf(" ba\n"); goto menu;

                           case 4:printf("bon\n"); goto menu;

                           case 5:printf("nam\n"); goto menu;

                           case 6:printf("sau\n"); goto menu;

                           case 7:printf("bay\n"); goto menu;

                           case 8:printf("tam\n"); goto menu;

                           case 9:printf("chin\n"); goto menu;

                           case 10:printf(" muoi\n"); goto menu;

                           }

              }

       menu2:

              {

                     int chuc;

                     if (n > 10 && n < 100)

                           chuc = n / 10;

                     n = n % 10;

                     switch (chuc)

                     {

                     case 1: printf("muoi"); goto menu1;

                     case 2: printf("hai muoi "); goto menu1;

                     case 3: printf("ba muoi "); goto menu1;

                     case 4: printf("bon muoi "); goto menu1;

                     case 5: printf("nam muoi "); goto menu1;

                     case 6: printf("sau muoi "); goto menu1;

                     case 7: printf("bay muoi "); goto menu1;

                     case 8: printf("tam muoi "); goto menu1;

                     case 9: printf("chin muoi "); goto menu1;

                     }

              }

       }

       _getch();

}