Conversion of numbers to English words(Using Stack)

[aruljothi]

/* Program to take an input in form of number and display it in words.
   The number ranges from 0 to 999999999 */


#include<stdio.h>
#include<conio.h>

#define SIZE 9

int top = -1;
int stack[SIZE];
int nested_flag = 1;

void push(int item)
{

   if(top==SIZE-1)
   {
      printf("
Number too big.Stack overflow.
");
      printf("Press any key to exit......");
      getch();
      exit(0);

   }

   else
      stack[++top] = item;

}

void print(int num)
{

   switch(num)
   {

      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;

   }

}

void print_pair(int num)
{

   switch(num)
   {

      case 1:
         switch(stack[top])
         {

            case 1:
               printf("Eleven ");
               break;

            case 2:
               printf("Twelve ");
               break;

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

            case 4:
               printf("Fourteen ");
               break;

            case 5:
               printf("Fifteen ");
               break;

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

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

            case 8:
               printf("Eighteen ");
               break;

            case 9: printf("Nineteen ");
               break;

            case 0:
               printf("Ten ");
               nested_flag = 0;
         }
         break;

      case 2:
         printf("Twenty ");
         break;

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

      case 4:
         printf("Forty ");
         break;

      case 5:
         printf("Fifty ");
         break;

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

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

      case 8:
         printf("Eighty ");
         break;

      case 9: printf("Ninety ");
         break;

   }

}

void translate(int length)
{

   if(length==9)
   {
      print_pair(stack[top--]);

      if(stack[top+1]!=1 && nested_flag)
         print(stack[top--]);
      else
         top--;

      printf("Crores ");

   }

   if(length>=7)
   {

      if(length==8)
      {

         print(stack[top--]);
         printf("Crores ");

      }

      print_pair(stack[top--]);

      if(stack[top+1]!=1 && nested_flag)
         print(stack[top--]);

      else
         top--;

      if(stack[6]!=0||stack[5]!=0)
         printf("Lakhs ");

      if(nested_flag==0)
            nested_flag = 1;

   }

   if(length>=5)
   {

      if(length==6)
      {

         print(stack[top--]);
         printf("Lakhs ");

      }

      print_pair(stack[top--]);

      if(stack[top+1]!=1 && nested_flag)
         print(stack[top--]);
      else
         top--;

      if(stack[4]!=0||stack[3]!=0)
         printf("Thousand ");

      if(nested_flag==0)
         nested_flag = 1;

   }

   if(length>=3)
   {

      if(length==4)
      {

         print(stack[top--]);
         printf("Thousand ");

      }

      print(stack[top--]);

      if(stack[2]!=0)
         printf("Hundered ");

      if(stack[1]==0&&stack[0]!=0)
      {

         printf("AND ");
         print(stack[0]);

      }

      else if(stack[1]!=0)
      {

         printf("AND ");
         print_pair(stack[top--]);

         if(stack[top+1]!=1 && nested_flag)
            print(stack[top--]);

      }

   }

   if(length==2)
   {

      print_pair(stack[top--]);

      if(stack[top+1]!=1 && nested_flag)
         print(stack[top--]);

      if(nested_flag==0)
         nested_flag = 1;

   }

   if(length==1)
      print(stack[top--]);

}

void main()
{

   long number;
   clrscr();

   printf("Enter the number to be translated: ");
   scanf("%ld",&number);

   while(number>0)
   {

      push(number%10);
      number = number/10;

   }

   translate(top+1);
   getch();
}t