a program that calculates the square root of a number accepted by the user through the keyboard

take a look through the Math library.

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If you're not allowed to use the Math class then what you do is try some divide and conquer approach.

If the input number (number) is greater than 1:

Set anum = number
Set bnum = 1
(Loop)
Set tnum = (anum + bnum) / 2
Calculate the square of tnum. (cnum = tnum * tnum)
compare cnum to number
if equal (within some reasonable interval cnum = number +/- epsilon where epsilon is a very small constant) print cnum and Exit the loop (best implemented with a while-statement.
else if (cnum < number), set bnum = tnum
else if (cnum > number), set anum = tnum
(end Loop)


The case where number is less than 1 is very similar and you will have to consider some special cases where number = 0 or 1. This algorithm is very simple to translate into code.

This post has been edited by Gloin: 12 Oct, 2008 - 05:13 AM

I am a beginner with Java myself, and I recently had a program like this

I think what you are asking is how to possibly get the input from the user, and have it output the answer to the screen.

What I do to help myself with some of the programs is to make some pusedo code of what exactly needs to happen,
or make a flowchart so you can physically see what you want the program to do.

Here are some tips that helped me, mabey they will work for you as welll;

*I do all my initial stuff on paper first, its just helps me before I start the actual code

*Ask yourself what input you want from the user
then capture it

*Ask yourslef what output you want to print to the screen
then capture it

*Try to declair your variables first, then after they are declaired skip down a few lines
and initialize them

*Start off with your first promt to the user

*Then do the second promt (if any)

*Code your algorythm then output it to the screen

*Alawys show the line numbers, this really helps when you compile it
it will tell you the line the errors are on, if any, and give you a suggestion
as how to fix it.

Hope this helps you a bit and dosent confuse you, post your code to the forums when you get it if you
have any more questions.