Program to convert Currancy to Indian Style ?

#include<stdio.h>
#include<conio.h>
char one[20][10]=  {"","One","Two","Three","Four","Five","Six","Seven","Eight","Nine","Ten","Eleven","Twelve","Thirteen","Fourteen","Fifteen","Sixteen","Seventeen","Eighteen","Ninteen"};
char tens[10][10]={"","","Twenty","Thirty","Fourty","Fifty","Sixty","Seventy","Eighty","Ninty"};
void display(int n)
{
int r;
if(n<20)
printf(" %s ",one[n]);
else
{
   r=n%10;
   n=n/10;
   printf(" %s %s ",tens[n],one[r]);
}
}
void main()
{
long n,m;
int a[5];
int c=0;
clrscr();
printf("Enter number : ");
scanf("%ld",&n);
m=n;
while (n>0)
{
 if (c==1)
 {
  a[c]=n%10;
  n=n/10;
 }
 else
 {
  a[c]=n%100;
  n/=100;
 }
 c++;
}
c--;
if (m>=10000000L)
{
 display (a[c]);printf("Crore");c--;
 if (a[c]>0)
 {
  display (a[c]);printf("Lack");
 }c--;
 if (a[c]>0)
 {
  display(a[c]);printf("Thousand");
 }c--;
 if (a[c]>0)
 {
  display(a[c]);printf("Hundred");
 }c--;
 if (a[c]>0)
  display(a[c]);
}
else if(m>=100000L)
{
 display (a[c]);printf("Lack");c--;
 if (a[c]>0)
 {
  display(a[c]);printf("Thousand");
 }c--;
 if (a[c]>0)
 {
  display(a[c]);printf("Hundred");
 }c--;
 if (a[c]>0)
  display(a[c]);
}
else if(m>=1000)
{
 display(a[c]);printf("Thousand");c--;
 if (a[c]>0)
 {
  display(a[c]);printf("Hundred");
 }c--;
 if (a[c]>0)
  display(a[c]);
}
else if(m>=100)
{
 display (a[c]);printf("Hundred");c--;
 if (a[c]>0)
  display(a[c]);
}
else
 display(a[c]);
getch();
}