Array program

Question

hey guys
well, i have a little problem with my prac. anyone who can help, please do!!!!!!!! well the prac is like this:
- use an initialiser list to create an array that holds all the prime numbers between 2 and 100;
- prime numbers are : 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97
-request a number between 2 and 100
- inform the user if that number is prime
- repeat this indefinitely until the user supplies a negative number
- if the response is not a negative number and not between 2 and 100 then inform the user that the response is invalid!!!
nowwwwwwww, here's what i have done so far,
please reply with suggestion!!
public class prac7
{  public static void main (String[] args)
int[] primes = {2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97};
int response = 2;
     Screen.out.println ("");
     Screen.out.println (" ........Hello and Welcome!!.........");
     Screen.out.println ("");
     Screen.out.print (" Please enter a number between 2 and 100: ");
     response = Keybd.in.readInt();
     for (......................) // what goes here???
     // how is it possible to compare the response to all the prime numbers above//
     if (response == primes.length) {
     Screen.out.println ("");     
     Screen.out.println (" - The number you have requested is prime!!");
     int count = 4;
     while (count > 0) {
          Screen.out.println (" - Good one!!");
          count = count - 1;
     else if (response > 100) {
     Screen.out.println ("");     
     Screen.out.println (" - The response is invalid.");
     Screen.out.println ("");
     Screen.out.println (" - Good luck next time!! Can't be that hard!!!");
     else if (response < 0) { 
     Screen.out.println ("");     
     Screen.out.println (" - Out of my range!!");
     else
     Screen.out.println ("");
     Screen.out.println (" - Not a prime number!!");
}

Answer 1

Okay let's get serious ;)
replace all your if else stuff to this
if(response > 100) {
            Screen.out.println("");
            Screen.out.println(" - The response is invalid.");
            Screen.out.println("");
            Screen.out.println(" - Good luck next time!! Can't be that hard!!!");
        else if (response < 0) {
            Screen.out.println("");
            Screen.out.println(" - Out of my range!!");
        else {// okay enough of other checking time to check for primes
            boolean found = checkPrime(response);
            if(found)
                Screen.out.println(" - The number you have requested is prime!!");
            else
                Screen.out.println(" - Not a prime number!!");
        }add a new function
private boolean checkPrime(int response) {
        for(int w=0;w<primes.length;w++) {
            if(response==primes[w]) {
                return true; //if one of them matches we found it so quit checking
        return false; //didn't find a match sad :(
unformattted one
replacement code
if(response > 100) {
Screen.out.println("");
Screen.out.println(" - The response is invalid.");
Screen.out.println("");
Screen.out.println(" - Good luck next time!! Can't be that hard!!!");
else if (response < 0) {
Screen.out.println("");
Screen.out.println(" - Out of my range!!");
else {// okay enough of other checking time to check for primes
boolean found = checkPrime(response);
if(found)
Screen.out.println(" - The number you have requested is prime!!");
else
Screen.out.println(" - Not a prime number!!");
extra function
private boolean checkPrime(int response) {
for(int w=0;w<primes.length;w++) {
if(response==primes[w]) {
return true; //if one of them matches we found it so quit checking
return false; //didn't find a match sad :(
Thanks
Joey