C Programming: How to Display Output from Numbers to Words?

Hello guys! I'm new in C programming and i want to know how to display out in words if number is inputed, using switch or an if..else statement. I have a little program sample but in my case the number inputed not would be greater than 9000.
Example:
if inputed is 168
The output will be "One Hundred-Sixty Eight"
I have a program but it only prints 1-10 ..T_T
Here's the code:

Code:

---

#include<stdio.h>
void main()
{
int i=0;
unsigned long int digit;
char str[12],ch;
puts(“Enter the number (less than 10 digit)”);
scanf(“%lu”,&digit);
ultoa(digit,str,10); /*converts an unsigned long int to string*/
while(str[i]!=’\0′)
{
ch=str[i];
i++;
switch(ch)
{
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 ’0′:
printf(“ZERO “);
break;
}
}
}

---

That's the code i could only create but i need to know when big numbers is inputed and printing in words.Thanks!

Do you know the names of the numbers after nine? Do you see a pattern in them? That might be a place to start.

Also: I've never come across "ultoa" before. If it happens to exist on your system, then well done for using it; but I'm pretty sure you won't actually want to use it, in your case.

Here's my Code but still in error but the program runs..when i input 173 it displays one hundred seventy only!.. here's the code:

Code:

---

#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
int num, a,w,x,y,z,g;

printf("Enter a number: ");
scanf("%d", &num);
 
 
a=num/1000;
g=a/100;
if (a==1)
  printf("one thousand");
else if (a=g)
    printf("four");
else if (a == 2)
  printf("two thousand");
else if (a== 3)
  printf("three thousand");
else if (a == 4)
  printf("four thousand");
else if (a == 5)
  printf("five thousand");
else if (a==6)
  printf("six thousand");
else if (a == 7)
  printf("seven thousand");
else if (a == 8)
  printf("eight thousand");
else if (a == 9)
  printf("nine thousand");
 
y=num % 1000;
if (y >= 100 && y < 200)
  printf(" one hundred");
else if (y >= 200 && y < 300)
  printf(" two hundred");
else if (y >= 300 && y < 400)
  printf(" three hundred");
else if (y >= 400 && y < 500)
  printf(" four hundred");
else if (y >= 500 && y < 600)
  printf(" five hundred");
else if (y >= 600 && y < 700)
  printf(" six hundred");
else if (y >= 700 && y < 800)
  printf(" seven hundred");
else if (y >= 800 && y < 900)
  printf(" eight hundred");
else if (y >= 900 && y < 1000)
  printf(" nine hundred");
 
z=num%100;
if (z >= 20 && z < 30)
  printf( " twenty");
else if (z >= 30 && z < 40)
  printf( " thirty");
else if (z >= 40 && z < 50)
  printf( " forty");
else if (z >= 50 && z < 60)
  printf( " fifty");
else if (z >= 60 && z < 70)
  printf( " sixty");
else if (z >= 70 && z < 80)
  printf( " seventy");
else if (z >= 80 && z < 90)
  printf( " eighty");
else if (z >= 90 && z < 100)
  printf( " ninety");
else if (z >= 10 && z < 20)
  {w = z;}
 
if (w == 10)
  printf(" ten");
else if (w == 11)
  printf(" eleven");
else if (w ==12)
  printf(" twelve");
else if (w == 13)
  printf(" thirteen");
else if (w == 14)
  printf(" fourteen");
else if (w == 15)
  printf(" fifteen");
else if (w == 16)
  printf(" sixteen");
else if (w == 17)
  printf(" seventeen");
else if (w == 18)
  printf(" eighteen");
else if (w == 19)
  printf(" nineteen");
 
 
if (z < 10 || z >= 20)
  {x = z % 10;}
else if (x == 1)
  printf(" one");
else if (x == 2)
  printf(" two");
else if (x == 3)
  printf(" three");
else if (x == 4)
  printf(" four");
else if (x == 5)
  printf(" five");
else if (x == 6)
  printf(" six");
else if (x == 7)
  printf(" seven");
else if (x == 8)
  printf(" eight");
else if (x == 9)
  printf(" nine");
 
  getch();
  }

---

Need some help about these..

Hello Guys Thank you for the codes specially ne55... ^_^ who PM me..
I want to share with you the code I've made using conditional statement..with guide of ne55..

here's my program:

Code:

---

#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
char *make_words(char *s, int ncomma);
char *insert_comma(long n, int *ncomma);
char *int2words(int n);
int a;
 
int main(void)
{
 


 printf("Enter number: ");
 scanf("%d",&a);
  printf("%d = %s\n",a,int2words(a));

 
  getch(); 
  return 0;
}

char *make_words(char *s, int ncomma)
{
  int i, len, rest = 0;
  char *p = NULL;
  static char zzz[256];
 
  static char *ones[] = {"one ","two ","three ","four ",
    "five ","six ","seven ","eight ","nine "};
  static char *tens[] = {"ten ","eleven ","twelve ","thirteen ",
    "fourteen ","fifteen ","sixteen ","seventeen ","eighteen ","nineteen "};
  static char *twenties[] = {"","twenty ","thirty ","forty ",
    "fifty ","sixty ","seventy ","eighty ","ninety "};
  static char *hundreds[] = {
    "hundred ","thousand ","million "};
 
  memset(zzz, '\0', 256);  // fill with nulls
  len = strlen(s);
  for(i = 0; i < len; i++)
  {
 
    if ((p = strchr((s[i] == ',') ? &s[++i] : &s[i], ',')) == NULL)
    {
      p = &s[strlen(s)];
    }
    if (s[i] == '0')
    {
      continue;  // skip one iteration
    }
    if ((rest = (p - &s[i])) != 0)
    {
      if (rest == 3)
      {
        strcat(zzz, ones[s[i] - '0' - 1]);
        strcat(zzz, hundreds[0]);

        if (len == 7 && s[2] == '0')  strcat(zzz, hundreds[1]);
        if (len == 11 && s[2] == '0')  strcat(zzz, hundreds[2]);
      }
      else if (rest == 2)
      {
        if (s[i] == '1')
        {
          strcat(zzz, tens[s[++i] - '0']);
          rest--;
        }
        else
        {
          strcat(zzz, twenties[s[i] - '0' - 1]);
        }
      }
      else
        strcat(zzz, ones[s[i] - '0' - 1]);
    }
    if (rest == 1 && ncomma != 0)
    {
      strcat(zzz, hundreds[ncomma--]);
    }
  }
  return zzz;
}
 

char *insert_comma(long n, int *ncomma)
{
  static char zzz[30];
  int i = 0;
  char *p = &zzz[sizeof(zzz)-1];
 
  *p = '\0';
  *ncomma = 0;
  do
  {
    if (i % 3 == 0 && i != 0)
    {
      *--p = ',';
      ++*ncomma;
    }
    *--p = (char)('0' + n % 10);
    n /= 10;
    i++;
  } while(n != 0);
  return p;
}
 
char *int2words(int n)
{
  int nc;
  char *ps, *zzz, *minus;
  char *buffer;
  buffer = (char *) malloc(256);
 
  // save any - sign
  if (n < 0)
  {
    minus = "minus";
    n = abs(n);
  }
  else
  {
    minus = "";
  }
 
  ps = insert_comma(n, &nc);

  zzz = make_words(ps, nc);
 
  sprintf(buffer,"%s %s", minus, zzz);
 
  return buffer;
  getch();
}

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Thank You guys .. Marked as SOLVED!