CONVERT 4 DIGIT NUMBER INTO WORDS

/* WAP TO READ 4 DIGIT NUMBER AND PRINT IN WORDS */

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

main()
{
int a,b,c,d,n;
clrscr();
printf("\n Enter a 4 digit number (1000-9999):");
scanf("%d",&n);
if(n>999&&n<10000)
{
a=n%10;
n=n/10;
b=n%10;
n=n/10;
c=n%10;
n=n/10;
d=n%10;
n=n/10;
switch(d)
{
case 1: printf(" One thousand");
break;
case 2: printf(" Two thousand");
break;
case 3: printf(" Three thousand");
break;
case 4: printf(" Four thousand");
break;
case 5: printf(" Five thousand");
break;
case 6: printf(" Six thousand");
break;
case 7: printf(" Seven thousand");
break;
case 8: printf(" Eight thousand");
break;
case 9: printf(" Nine thousand");
break;
}
switch(c)
{
case 1: printf(" One hundred");
break;
case 2: printf(" Two hundred");
break;
case 3: printf(" Three hundred");
break;
case 4: printf(" Four hundred");
break;
case 5: printf(" Five hundred");
break;
case 6: printf(" Six hundred");
break;
case 7: printf(" Seven Hundred");
break;
case 8: printf(" Eight Hundred");
break;
case 9: printf(" Nine hundred");
break;
}
switch(b)
{
case 1: printf(" Ten");
break;
case 2: printf(" Twenty");
break;
case 3: printf(" Thirty");
break;
case 4: printf(" Fourty");
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;
}
switch(a)
{
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;
}
}
else
{
printf("\n Enter the value in between (1000-9999):");
}
getch();
}