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Write a program for even numbers..

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Join Date: Mar 2009

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Reputation: Tizzie is an unknown quantity at this point

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Tizzie

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Write a program for even numbers..

Mar 13th, 2009

So I have to write a program which writes all even numbers between 0 and 50 INTO AN ARRAY and then display them on the screen....

My problem is how i am going to put it into an array I only did part of it but I can't continue doing it...:-

public class Even_Number{
public static void main (String args[]) {
int L[]=new int[50];
int i;
int c =0;

for (i=0; i<50; i++)
if (i%2==0)
{
c++;
L[c] = i;

}

}
}

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Join Date: Nov 2008

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verruckt24 verruckt24 is offline

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Re: Write a program for even numbers..

Mar 13th, 2009

Why can't you continue doing it ? As far as I am seeing you are going good.

Just one thing, if you know you are going to put only even numbbers in the array from amongst 50 numbers, instead of declaring the array as

 Help with Code Tags 
 java Syntax (Toggle Plain Text) 
int L[]=new int[50];
int L[]=new int[50];

you can safely do this:

 Help with Code Tags 
 java Syntax (Toggle Plain Text) 
int [] L = new int[50/2];
int [] L = new int[50/2];

Out of any set of fifty numbers there are never going to be more than 25 even numbers, isn't it so you are saving space on 25 numbers where each one is 4 bytes 25 x 4 = 100 bytes.

Last edited by verruckt24; Mar 13th, 2009 at 1:28 pm.

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Join Date: Jan 2007

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stultuske

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Re: Write a program for even numbers..

Mar 16th, 2009

and you could do the next:

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 Java Syntax (Toggle Plain Text) 
int[] evens = new int[25];
// as Verruckt pointed out, you don't need one of size 50
int location = 0;
for ( int i = 2; i < 50; i = i + 2){
  evens[location] = i;
  location += 1;
}
int[] evens = new int[25];
// as Verruckt pointed out, you don't need one of size 50
int location = 0;
for ( int i = 2; i < 50; i = i + 2){
  evens[location] = i;
  location += 1;
}

there's not really the need to perform a check for evens.
with the (i % 2) test you'll get the right contents, but it's easier just to add 2 every time during the loop