C program

See:
http://hk.knowledge.yahoo.com/question/question?qid=7008101401531

Reproduced here and adapted for your convenience:

2) Write a program that reads in one positive integer, separates the number into its individual digits and prints the digits from right to left, separated from one another by three spaces each.
For example, if your program reads 13579, it should print:
9 7 5 3 1

#include <stdio.h>
int main(int argc, char *argv[])
{
long n=-1;
int digit;
while(n>99999||n<0)
{
printf("enter a positive number (max. 5 digits)");
scanf("%ld",&n);
}
while(n>0)
{
printf("%d ",n%10);
n/=10;
}
printf("\n");
}

Use modulus 10 (%10) to obtain last digit one by one (perhaps using a while loop), multiply to become new digit at new integer, then use integer division to remove last digit of original number