WAP to perform this :: 123->one two three

#include<stdio.h>
#include<conio.h>
int rev(int);
void main()
{
    int num,a,rem,sum;
    clrscr();
    printf("enter a number");
    scanf("%d",&num);
    a=rev(num);
    while(a>0)
    {
        rem=a%10;
        a=a/10;
switch(rem)
{
case 1:
printf("one\n");
break;

case 2:
printf("two\n");
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;

default:
printf("wrong input");
}
}
getch();

}
int rev(int num)


{
int rem,sum=0;
    while(num>0)
    {
        rem=num%10;
        sum=sum*10+rem;
        num=num/10;
    }
return(sum);
}

output::
enter a number123
one                                                                            
two                                                                            
three