June 7, 2005

The following code demonstrates how to validate email using regular expression: import java.util.regex.*;class regexSample { public static void main(String args[]) { //Input the string for validation String email = “[email protected]”; //Set the email pattern string Pattern p = Pattern.compile(“[email protected]+\.[a-z]+”); //Match the given string with the pattern Matcher m = p.matcher(email);

It’s important to use recursion carefully to avoid running into stack overflow. This sample code reverses a given integer number using recursion: #include “stdafx.h”int myreverse(int num){ static int nLocal = 0; if(num > 0) nLocal = (nLocal* 10) + (num%10) ; else return nLocal; return myreverse(num/10);}int main(int argc, char* argv[]){