C Program That Convert Number To Words

Hello friends today i'm sharing a program i.e very interesting,its code is little bit big but you can easily understand it.In This program you can enter any number(maximum 4 digit) after that this program convert that number to words.

   for example:-"1234" is equivalent to "one thousand two hundred thirty four "


#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
 char num[100],s[100];
 int len,rem,n,j;
 clrscr();
 printf("\n Enter any number(maximam 4 digit):");
 gets(num);
 len=strlen(num);
 n=atoi(num);
 while(n!=0)
 {
     j=n;
   while(j!=0)
   {
    rem=j%10;
    j=j/10;
   }
   if(len!=2)
   {
   switch(rem)
   {
    case 1:
     printf(" one ");
     break;
    case 2:
     printf(" two ");
     break;

    case 3:
     printf(" three ");
     break;

    case 4:
     printf(" four ");
     break;
    case 5:
     printf(" five ");
     break;

    case 6:
     printf(" six ");
     break;

    case 7:
     printf(" seven ");
     break;

    case 8:
     printf(" eight ");
     break;
    case 9:
     printf(" nine ");
     break;
    case 10:
     printf(" ten ");
   }
       }
 if(len==4)
  printf(" thousand ");
 else if(len==3)
  printf(" hundred ");
 else if(len==2)
 {
  if(n==11)
  {
   printf("eleven");
   break;
  }
  else if(n==12)
  {
   printf("twelve");
   break;
  }
  else if(n==13)
  {
   printf("thirteen");
   break;
  }
  else if(n==14)
  {
   printf("fourteen");
   break;
  }
  else if(n==15)
  {
   printf("fifteen");
   break;
  }
  else if(n==16)
  {
   printf("sixteen");
   break;
  }
  else if(n==17)
  {
   printf("seventeen");
   break;
  }
  else if(n==18)
  {
   printf("eighteen");
   break;
  }
  else if(n==19)
  {
   printf("ninteen");
   break;
  }
  else if(n>=20&&n<30)
   printf(" twenty ");
  else if(n>=30&&n<40)
   printf(" thirty ");
  else if(n>=40&&n<50)
   printf(" fourty ");
  else if(n>=50&&n<60)
   printf(" fifty ");
  else if(n>=60&&n<70)
   printf(" sixty ");
  else if(n>=70&&n<80)
   printf(" seventy ");
  else if(n>=80&&n<90)
   printf(" eighty ");
  else if(n>=90&&n<100)
   printf(" ninty ");
 }
 if(len==4)
  n=n-(rem*1000);
 else if(len==3)
  n=n-(rem*100);
 else if(len==2)
  n=n-(rem*10);
 else if(len==1)
  n=n-rem;
 itoa(n,s,10);
 len=strlen(s);
 n=atoi(s);
}
 getch();
 return(0);
}

       Thanks Friends......