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most number guessing programs make you guess the number but heres one where the computer guesses ether random or the most efficient way.

Python, 56 lines
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#####################################################################
# program name: guess.py
# auther: max baseman
# email: dos.fool@gmail.com
# date: 5/01/07
# short description: 
# this is a program that has two features
# one that randomly picks numbers till it gets yours
# and one that picks the most effective way till it gets your number
#####################################################################

from random import randrange as random
print "welcome to a number guessing program"
print
print "enter 1 for random "
print "or"
print "enter 2 for efficient"
print
guesstype=input(" >")
if guesstype == 1:
    number=input("pick a number >")
    numrange=input("pick a range >")+1
    guessed=[0]
    guess=random(numrange)
    if guess==0:
        guess=random(numrange)
    print guess
    guessed.append(guess)
    guesses=1
    while guess!=number:
        guessed.append(guess)
        guesses=guesses+1
        guess=random(numrange)
        if guess in guessed:
            while guess in guessed:
                guess=random(numrange)
        print guess
    print"i got the number",number,"in",guesses,"guesses, out of a range of",numrange-1
elif guesstype == 2:
    number=input("pick a number >")
    numrange=input("pick a range >")+1
    guess=numrange/2
    print guess
    guesses=1
    min=0
    max=numrange
    while guess!=number:
        if guess < number:
            min=guess
        else:
            max=guess
        guess = (min+max) /2
        guesses= guesses +1
        print guess
    print "i got the number",number,"in",guesses,"guesses, out of a range of",numrange-1
print

    
    
        
    
    
                
                

this program is mostly for fun maybe if someone was working in number theory or pasterns in randomness this might be useful.

1 comment

Steven Bethard 14 years, 8 months ago  # | flag

A cleaner, more extensible version.

import random
import textwrap

def iter_random_guesses(n, max):
    guessed = set()
    while True:
        guess = random.randrange(max)
        if guess in guessed:
            continue
        else:
            guessed.add(guess)
            yield guess

def iter_efficient_guesses(n, max):
    min = 0
    while True:
        guess = (min + max) / 2
        yield guess
        if guess &lt; n:
            min = guess
        else:
            max = guess


if __name__ == '__main__':

    guess_iter_map = {1: iter_random_guesses,
                      2: iter_efficient_guesses}

    print textwrap.dedent('''\
        welcome to a number guessing program

        enter 1 for random
        or
        enter 2 for efficient
        ''')

    guess_type = int(raw_input('> '))
    n = int(raw_input('pick a number> '))
    max = int(raw_input('pick a range > '))
    get_guess_iter = guess_iter_map[guess_type]
    guess_iter = get_guess_iter(n, max + 1)
    for i, guess in enumerate(guess_iter):
        print guess
        if guess == n:
            break
    tup = n, i + 1, max
    print 'I got the number %i in %i guesses, out of a range of %i' % tup
Created by max baseman on Fri, 30 Mar 2007 (PSF)
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