Lập trình C :Nhập vào một số và viết số đó ra thành chữ

#include "stdio.h"

#include "conio.h"

void main()

{

       int n, chuc, tram, donvi, tam;

menu:

       printf("\n Nhap vao so can viet : ");

       scanf_s("%d", &n);

       if (n < 0 || n>1000)

       {

              printf("Xin moi nhap so trong khoang tu o den 1000 : \n");

              printf("Nhap vao so can viet : \n");

              scanf_s("%d", &n);

       }

       printf("\n^^^^^^^^^^^^^^^^^^^^^^^^^^ ");

       if (n < 1000)

       {

              tram = n / 100;

              tam = n % 100;

              chuc = tam / 10;

              donvi = tam % 10;

              if (tram == 0) printf("");

              if (tram == 1) printf("mot tram");

              if (tram == 2) printf("hai tram");

              if (tram == 3) printf("ba tram");

              if (tram == 4) printf("bon tram");

              if (tram == 5) printf("nam tram");

              if (tram == 6) printf("sau tram");

              if (tram == 7) printf("bay tram");

              if (tram == 8) printf("tam tram");

              if (tram == 9) printf("chin tram");

              if (chuc == 0) printf("");

              if (chuc == 1) printf(" muoi");

              if (chuc == 2) printf(" hai muoi ");

              if (chuc == 3) printf(" ba muoi ");

              if (chuc == 4) printf(" bon muoi ");

              if (chuc == 5) printf(" nam muoi ");

              if (chuc == 6) printf(" sau muoi ");

              if (chuc == 7) printf(" bay muoi ");

              if (chuc == 8) printf(" tam muoi ");

              if (chuc == 9) printf(" chin muoi ");

              if (tram == 0 && chuc == 0 && donvi == 0) printf("khong");

              if (donvi == 0) printf("");

              if (donvi == 1 && chuc != 0) printf("mot");

              if (donvi == 2 && chuc != 0) printf("hai");

              if (donvi == 3 && chuc != 0) printf("ba");

              if (donvi == 4 && chuc != 0) printf("bon");

              if (donvi == 5 && chuc != 0) printf("lam");

              if (donvi == 6 && chuc != 0) printf("sau");

              if (donvi == 7 && chuc != 0) printf("bay");

              if (donvi == 8 && chuc != 0) printf("tam");

              if (donvi == 9 && chuc != 0) printf("chin");

              if (donvi == 0 && tram == 0 && chuc == 0) printf("");

              if (donvi == 1 && tram == 0 && chuc == 0) printf("mot");

              if (donvi == 2 && tram == 0 && chuc == 0) printf("hai");

              if (donvi == 3 && tram == 0 && chuc == 0) printf("ba");

              if (donvi == 4 && tram == 0 && chuc == 0) printf("bon");

              if (donvi == 5 && tram == 0 && chuc == 0) printf("nam");

              if (donvi == 6 && tram == 0 && chuc == 0) printf("sau");

              if (donvi == 7 && tram == 0 && chuc == 0) printf("bay");

              if (donvi == 8 && tram == 0 && chuc == 0) printf("tam");

              if (donvi == 9 && tram == 0 && chuc == 0) printf("chin");

              if (donvi == 1 && chuc == 0 && tram != 0) printf(" le mot");

              if (donvi == 2 && chuc == 0 && tram != 0) printf(" lehai ");

              if (donvi == 3 && chuc == 0 && tram != 0) printf(" le ba ");

              if (donvi == 4 && chuc == 0 && tram != 0) printf(" le bon ");

              if (donvi == 5 && chuc == 0 && tram != 0) printf(" le nam");

              if (donvi == 6 && chuc == 0 && tram != 0) printf(" le sau");

              if (donvi == 7 && chuc == 0 && tram != 0) printf(" le bay");

              if (donvi == 8 && chuc == 0 && tram != 0) printf(" le tam");

              if (donvi == 9 && chuc == 0 && tram != 0) printf(" le chin");

       }

       if (n == 1000) printf("mot nghin");

       printf(" ^^^^^^^^^^^^^^^^^^^^^^^^^^^\n");

       printf("\n **************************************************************\n   * \t\t Coder : NGUYEN HOANG VAN NHA  \t\t    *\n **************************************************************\n");

       goto menu;

       _getch();

}