Computer Science Canada

Program Help! Please!Important!
Author:  Caceres [ Fri Jun 30, 2006 10:13 pm ]
Post subject:  Program Help! Please!Important!
Hello. I was wondering if someone could help me with making this program. I'm not sure of the codes (the info I put into the editor).
I used Crimson Editor.
And so far..I have..

code:
import TerminalIO.KeyboardReader;

public class ass25c {
        public static void main(String[] args) {
                System.out.print("Please enter marks\nWhen you've entered them all, type -1.\n");
        }
}


The assignement is" Write a program that will calculate the average for a set of marks. The user enters a -1 when there are no more marks to enter. The program will count the number of marks entered and calculate the average. The output could look like this :

You entered 24 marks and the average is 73.8. "

I'm a newbie programmer (literally an extreme newb) and i Don't know how to make this program.
Thank you.
~Caceres
Author:  TheFerret [ Sat Jul 01, 2006 1:19 am ]
Post subject: 
We are not going to write your program, so don't expect that... But, you have to find what number people input and then add it onto a total and add 1 to how many numbers people enter and if they enter -1 exit... After that, you output total/number...
Author:  cool dude [ Sat Jul 01, 2006 9:43 am ]
Post subject: 
wow i recently just started learning java myself and even i can make such a simple program. its really simple

1) make a variable count and every time a mark is inputed make count increase by 1
code:
int count = count + 1;


2)everytime a new mark is entered make a sum variable and add the new mark to the old mark and store it in the sum variable.

3)make a average variable and to get average divide the sum of all the marks by the count (how many marks in total)
code:
int average = sum / count


4)then all you have left is to display the output
code:
system.out.println("you entered " + count + " marks and the average is " + average);

Note: make a conditional loop for when your entering marks so that you can exit the loop when user enters -1 or it will keep asking for marks.

hope that helps
Author:  wtd [ Sat Jul 01, 2006 9:52 am ]
Post subject: 
cool dude wrote:
wow i recently just started learning java myself and even i can make such a simple program. its really simple

1) make a variable count and every time a mark is inputed make count increase by 1
code:
int count = count + 1;


This is not quite right. Wink
Author:  cool dude [ Sat Jul 01, 2006 11:00 am ]
Post subject: 
wtd wrote:
cool dude wrote:
wow i recently just started learning java myself and even i can make such a simple program. its really simple

1) make a variable count and every time a mark is inputed make count increase by 1
code:
int count = count + 1;


This is not quite right. Wink


hmmm... i think its because i can't declare it on the same line like that because i have to first initialize it. right?

code:

int count = 0;
count = count + 1;
Author:  wtd [ Sat Jul 01, 2006 11:51 am ]
Post subject: 
Yes. Variables should always be initialized before they're used. It just happens that in Java that initialization should be explicit.
Author:  Token [ Sat Jul 01, 2006 12:20 pm ]
Post subject: 
Just a shortcut

code:
count++;


increments by one Very Happy
Author:  wtd [ Sat Jul 01, 2006 12:39 pm ]
Post subject: 
Or more generally:

code:
count += 1;
Author:  Caceres [ Sat Jul 01, 2006 1:35 pm ]
Post subject: 
public class ass25c {
public static void main(String[] args) {
KeyboardReader reader = new KeyboardReader();
int count = 0;
int stop = -1;

System.out.println("Please enter marks\nWhen you've entered them all, type -1:");

for(count=0; count==stop; count=count++) {;
}
}
}

My information still doesn't work. :S
Author:  cool dude [ Sat Jul 01, 2006 1:42 pm ]
Post subject: 
you need to learn the basics of java! firstly why are u using a counted loop to see if the user pressed -1 to exit??? thats incorrect. if u read my post i told you use a conditional loop also you don't even know how to make a counted loop! although you don't need it. read my post carefully, because i tell you step be step wat to write!

P.S. obviously your information still doesn't work and i really hope you see why!
Author:  Caceres [ Sat Jul 01, 2006 4:09 pm ]
Post subject: 
I don't know whta a condition loop is.
This is my 5th day with Java. All i've learned is "if", "while" and "for".
Author:  wtd [ Sat Jul 01, 2006 4:19 pm ]
Post subject: 
A "counting loop" is a "conditional loop." Just a fairly predictable loop.

Basically, in a loop you start with some initial state. You then proceed to do something. At some point you check to see if a condition holds true. If it does not, then you exit the loop. At the end of each iteration of the loop, you have some kind of update.

A simple loop:

code:
for (int i = 0; i < 10; i++) {
   System.out.println(i);
}


Includes all four parts. The initial state is:

code:
int i = 0


The test is:

code:
i < 10


The update is:

code:
i++


And the thing you're doing is:

code:
System.out.println(i);
Author:  cool dude [ Sun Jul 02, 2006 10:14 am ]
Post subject: 
instead of your counted loop which uses "for" use something like this:
code:

while (mark != -1) {
//code
}


as you can see the loop will keep looping while the mark is not -1. as soon as the user enters the mark -1 it will exit the loop. now inside this loop you put your code.
Author:  Aziz [ Wed Jul 12, 2006 2:01 pm ]
Post subject: 
It seems you barely even know the basics of programming, so I suggest a full-blown tutorial:

The Java Tutorial

Follow that, young friend. Then go to "Learning the Java Language" on the same site.
Author:  Aziz [ Wed Jul 12, 2006 2:04 pm ]
Post subject: 
ADD: (sorry, I can't seem to remember how to edit, or why it won't let me)

Or check out this tutorial here:
http://www.compsci.ca/v2/viewtopic.php?t=9576

:


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