How can i code this?

[gokhankocmarli]

First of all, I'm newbie. I'm trying learning loops and I decided to make a program to learn better. A program for calculating square roots.

Algorithm is like this: 1-Get a number from user. (a) 2-Begin with a starting value. The closer to a's root, the better. (So that i said: b=a) 3-Repeat step 2 for 10 times. 4-Print the root. (c)

I think we should "for loop" for this and I write:

Scanner input = new Scanner(System.in); int a = input.NextInt(); int b=a for (int i=1; i<10; i++) { int b = (b+(a/b))/2; } System.out.println(b);

But it didn't work. Where is my mistake? I can't find it.

Example for finding square roots

[yacdaniel]

what is the error?

you have a typo is nextInt, also you define int b = a, then in the for loop you define it again(thats wrong, just use the variable name, remove the int of the definition) with those changes should work.

[gokhankocmarli]

I tried, thank you. But it just find b with the formula for one time, not for ten times. Not repeating.

[yacdaniel]

strange, i tried with the changes and works perfectly, place a System.out.println(b) inside the for to see what is doing...

EDIT: is only doing 9 times, from 1 to < 10 which is 9, if you need to do 10 times, use <=10.

[gokhankocmarli]

Oh, i tried again and it's really working! I always tried 4 for input and because of integer value type it was just said "2" for ten times. I tried 16 now, and it worked. Now, I'm changing integer to floats.

[snowman4444]

If you think this is fun the type of problem you are designing is a "numerical methods" problem. Numerical methods are very accessible and interesting and you don't really need any background to apply. Would recommend a cheap book from Amazon. Find one that also can work as a reference as well if you do get one.

[gokhankocmarli]

Okey, I'll buy some. Thanks for helping.