C Program to Convert an integer to words

C Program to Convert an integer to words

#include 
#include 

int main(void)
{
 char *unit_words[] = {"zero", "one","two","three","four","five","six","seven","eight","nine"};
 char *teen_words[] = {"ten", "eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"};
 char *ten_words[] = {"error", "error","twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"};
 char hundred[] = " hundred";
 char and[] = " and ";
 char value_str[50] = "";
 int value = 0;                     /* Integer to be converted        */
 int digits[] = {0,0,0};            /* Stores digits of value entered */
 int i = 0;

 printf("Enter a positive integer less than 1000: ");
 scanf("%d",&value);
 if(value >= 1000)
   value = 999;
 else if(value < 1)     value = 1;    while(value > 0)
 {
   digits[i++] = value%10;
   value /= 10;
 }

 if(digits[2] > 0)
 {
   strcat(strcat(value_str,unit_words[digits[2]]), hundred);
   if(digits[1]>0 || digits[0]>0)
     strcat(value_str, and);
 }
 if(digits[1] > 0)
 {
   if(digits[1] == 1)
     strcat(value_str,teen_words[digits[0]]);
   else
   {
     strcat(value_str,ten_words[digits[1]]);
     if(digits[0] > 0)
       strcat(strcat(value_str, " "), unit_words[digits[0]]);
   }
 }
 else
   if(digits[0] > 0)
     strcat(value_str, unit_words[digits[0]]);
 printf("\n%s\n", value_str);
 return 0;
}

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