Program Help! Please!Important!

[Caceres]

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

[TheFerret]

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...

[cool dude]

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

[wtd]

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.

[cool dude]

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.

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;

[wtd]

Yes. Variables should always be initialized before they're used. It just happens that in Java that initialization should be explicit.

[Token]

Just a shortcut

code:

count++;

increments by one

[wtd]

Or more generally:

code:

count += 1;

[Caceres]

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

[cool dude]

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!

[Caceres]

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".

[wtd]

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);

[cool dude]

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.

[Aziz]

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.

[Aziz]

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