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While loop

 

While loop, total up the even number from 2 to 200
karengsh

28 Jun, 2009 - 10:18 PM
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Hi,

I just can't figure out how to use the while loop to do the totalling up of even numbers in 2 to 300.

Here's the program that I tried :-

Failed miserably. Pls help me. Tks.
CODE

class NumberSequence {
public static void main (String[] args){
   int num = 2;
   while (num <= 200){
      int total = num;
      num+=2;
   System.out.print(total);}}}


Mod edit - Please code.gif

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BetaWar

RE: While Loop

28 Jun, 2009 - 10:27 PM
Post #2

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Please remember to put your code in the code tags, like so:
code.gif

Now, the code should look like so:
CODE
class NumberSequence {
  public static void main (String[] args){
    int num = 2;
    int total = 0;
    while (num <= 300){
      total += num % 2 == 0?num:0;
      num++;
      System.out.print(total);
    }
  }
}


HTMS
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Fuzzyness

RE: While Loop

28 Jun, 2009 - 10:30 PM
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Hope this helps! Goodluck!

Nevermind don't feel like doing your homework. Just saw your other 4 Threads.


This post has been edited by Fuzzyness: 28 Jun, 2009 - 10:50 PM
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Gloin

RE: While Loop

29 Jun, 2009 - 10:08 AM
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Use the formula for a arithmetic sum instead.

This post has been edited by Gloin: 29 Jun, 2009 - 11:17 PM
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computerfox

RE: While Loop

29 Jun, 2009 - 10:13 AM
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you can always use an extra variable... hope that helps smile.gif
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karengsh

RE: While Loop

29 Jun, 2009 - 05:44 PM
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This is for the benefit of those who wish to know how to do:-

int x = 2;

while ( x <= 200)
if ( x%2 == 0) // this check if the numbers between 2 & 200 is an even number, if yes, it goes next
total += x; // this would add up the even numbers
x++; // this will increaes x
}
System.out.print(total)
}}}

I thanked God who sent an Guardian Angel to me who helped me with this question and it happened to be my test question !!! Thank God!
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Fuzzyness

RE: While Loop

29 Jun, 2009 - 08:01 PM
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QUOTE(karengsh @ 29 Jun, 2009 - 05:44 PM) *

This is for the benefit of those who wish to know how to do:-

int x = 2;

while ( x <= 200)
if ( x%2 == 0) // this check if the numbers between 2 & 200 is an even number, if yes, it goes next
total += x; // this would add up the even numbers
x++; // this will increaes x
}
System.out.print(total)
}}}

I thanked God who sent an Guardian Angel to me who helped me with this question and it happened to be my test question !!! Thank God!


As Beta has already told you as previous mods have as well...

code.gif

and I dont suppose D.I.C. has a Religion Policy? huh2.gif

This post has been edited by Fuzzyness: 29 Jun, 2009 - 08:02 PM
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jbashask

RE: While Loop

2 Jul, 2009 - 02:23 AM
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QUOTE(karengsh @ 28 Jun, 2009 - 10:18 PM) *

Hi,

I just can't figure out how to use the while loop to do the totalling up of even numbers in 2 to 300.

Here's the program that I tried :-

Failed miserably. Pls help me. Tks.
CODE

class NumberSequence {
public static void main (String[] args){
   int num = 2,total;
   while (num <= 200){
          total += num;
      num+=2;}
   System.out.print(total);}}


Mod edit - Please code.gif


This post has been edited by jbashask: 2 Jul, 2009 - 02:25 AM
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DecafJava

RE: While Loop

2 Jul, 2009 - 10:53 AM
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Here is the simple way:

CODE

public static void main(String[] args) {
     int sum = 0;
     for (int i = 2; i <= 300; i += 2) {
          sum += i;
     }
     System.out.println("The sum is: " + sum);
}


You don't have to keep checking if it is an even number or not. When you start with 2 (the first even number) and keep on incrementing by 2, you will get all the even numbers.

This post has been edited by DecafJava: 2 Jul, 2009 - 10:57 AM
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karengsh

RE: While Loop

5 Jul, 2009 - 07:31 PM
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QUOTE(DecafJava @ 2 Jul, 2009 - 10:53 AM) *

Here is the simple way:

CODE

public static void main(String[] args) {
     int sum = 0;
     for (int i = 2; i <= 300; i += 2) {
          sum += i;
     }
     System.out.println("The sum is: " + sum);
}


You don't have to keep checking if it is an even number or not. When you start with 2 (the first even number) and keep on incrementing by 2, you will get all the even numbers.

Thanks but I was looking hard for the while loop way be'cos last minute discovered I haven't mastered that for my exam....
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mostyfriedman

RE: While Loop

6 Jul, 2009 - 02:43 AM
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as gloin said, you can use the formula for arithmetic sum..will be done in O(1)
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karengsh

RE: While Loop

6 Jul, 2009 - 03:18 AM
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QUOTE(mostyfriedman @ 6 Jul, 2009 - 02:43 AM) *

as gloin said, you can use the formula for arithmetic sum..will be done in O(1)



Thanks for showing. I know that the For is a simpler way. Anyway, thanks so much for being so willing to teach and share. Really appreciate it.
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