Thread: java quessing game

Use variables vs hardcoding numbers:

"is your number greater than 50? yes/no");

Replace the 50 with a variable that starts at 50 and then is computed as the game goes on.
Something like this:
first = 1
last = 50
top = 100
when > 50, last = (top - last)/2

That's a very rough idea. It needs some work.

Try doing the program in a series of small steps:
First step:
Change your current code to use variables as I suggested. Ask the question using the variable.
Change the variables to new values depending on the user's response. Print out the new values of the variables and the first step is done.


A way to visualize the problem would be two write a line with numbers from 1 to 20 (not 100 for now). Set a ptr to the number the user has chosen and pointers to the beginning and end of the range of possible value.
Now do a binary search by asking the user relative to the middle of the range.
If above the middle, move the lower range marker up to the middle and compute a new middle. If user says below move the top marker to the middle. As you ask questions one or the other marker will move. Eventually there will be one number between/at the markers.

Please post the code you are talking about.

If the response is not less that means greater. Change the bottom/left to the middle.
Have you tried the visual exercise I suggested?

That's probably right. Now try writing the simple one step program I suggested:
set initial values
ask question
move markers as per user's response
print out new value of markers

That is NOT the code I was talking about. Try again. Write code that only does the simple first step as discussed in posts #8 and #4. Make a complete class, that will compile and execute. Do it: One small step at a time.

Be sure to wrap your code with code tags:
[code=java]
YOUR CODE HERE
[/code]
to get highlighting and preserve formatting.

Please edit your post and wrap your code with code tags:
[code=java]
YOUR CODE HERE
[/code]
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The code should set the values of the variables with hardcoded values ONLY at the start.
After that the variables values are copied from other variables or computed.

The only two initial values would be 1 and 100. The middle would be computed. That would allow the range to be changed to 1 to 20 for easier testing.

Copy the statement(s) that you don't understand and ask a question about it.

In this statement:
last = 25;
25 is a hardcoded value. last's value should be computed based on the previous values of first, top and last. Look at the row of number I asked you to use to see how the markers are to be moved.

What happens to the logic of that statement if the range of numbers is changed to 1 - 20 for testing?

I suggested that you work on the problem, one small step at a time. You seem to have ignored my suggestion and are trying to write the whole program at once.

Try writing the code for the small first step as I suggested.

If you'd rather write all the code at once, I'll leave and let some one else try to help you.

The code you have posted shows some of the statements you will need. Trying to write the whole program at once will make for confusion. Doing it one step at a time will be a better approach.
Are you going to write the program I suggested in posts #4 and #8?

package project;
 
import java.util.Scanner;
 
public class Game {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int first = 1;
		int last = 10;
		int top = 20;
		System.out.print("is your number lesser than " + last + "?");
		String a = sc.next();
		if (a.equals("yes")) {
			last=last/2;
		}
		System.out.print("is your number lesser than " + last + "?");
		String b = sc.next();
		if (b.equals("yes")) {
			last = last/2;
		}
 
	}
}

I dont know how to write it..

Who wrote the code you posted in post#15? That has most of what the small first step should have.