Write a ‘C’ function that returns the k-th digit from the right in the positive integer n. For example, digit(829,1) returns 9, digit(829,3) returns 8. If k is greater than the number of digits in n then the function is to return –1. Include appropriate documentation in your program.

#include<stdio.h>

int digit(int,int);

main()

{

int num,pos,dg;

printf("\nEnter a number=");

scanf("%d",&num);

printf("\nEnter the position=");

scanf("%d",&pos);

dg=digit(num,pos);

if(dg==-1)

printf("\nInvalid position");

else

printf("\nDigit found in position %d is %d",pos,dg);

}

int digit(int n,int p)

{

int i=1;

while(i<p && n>=0)

{

n=n/10;

i++;

}

if(n==0)

return -1;

else

return n%10;

}