Cracking the interivew 19.2

gistfile1.txt

public class Question192
{
  public static int numZeros(int num) {
    int count = 0;
    if (num < 0) {
      return -1;
    }
    for(int i = 5; num / i > 0; i *= 5) {
      count += num / i;
    }
    return count;
  }
  
  public static void main(String[] args) {
    int num = 25;
    System.out.println( "Expected(6): " + numZeros(num) );
    
  }
}