I have been trying to figure out how to make it so that the user can only enter a positive whole number between 1 and 100 for this simple High/Low guess game. I would like it so anything other then a whole number between 1 and 100 will inform the user they can't do that for all inputs. Is there a simple way to do this?
What I have now:
count=0
play = true
while play == true
print "Give me a random number between 1 and 100: "
max= gets.to_i
num= rand(max)
puts "Now guess between 1 and " + max.to_s +
"."
print "What is your guess?: "
guess=gets.to_i
while guess != num && play != false
if guess > num
print "Too high! "
guess=gets.to_i
count+=1
elsif guess < num
print "Too low! "
guess=gets.to_i
count+=1
else
break
end
end
puts "Good Job! You figured it out in " + count.to_s + " attempts!"
print "Want to try again? y/n "
answer=gets.chomp!
if answer == 'n'
play = false
break
end
if
answer == 'y'
play = true
end
end
puts "Maybe next time..."
The easiest way to do that is to use a regular expression and a range.
guess = gets.chomp
if(guess =~ /\A\d+\Z/ && (1..100) === guess.to_i)
#do stuff
else
puts "Please enter a valid number"
end
The regular expression ensures that we get an input composed only of digits (a whole number) and the ranged checks to see if it is between 1 and 100.
if (1..100).include?(guess) && 0 == guess % 1
# ...
end
Related
Hello all I previously asked how to fix a guessing number game on ruby which I got all done but now the number of attempts or tries is not reflecting nicely. Do I resolve this?
This is the code:
def check(int, r_int)
tries = 0
if int < r_int
tries +=1
puts "Guess Higher"
elsif int > r_int
tries +=1
puts "Guess Lower"
elsif int == r_int
win = true
puts "You are correct"
puts "You had attempted this "+ tries.to_s + " times to win"
abort
end
end
This is the main function:
def main
win = false
puts "Lets play a game!"
puts "I am thinking of a number between 1 and 100"
rnd_int = rand(100)
while not win
guess = gets.chomp.to_i
value = check(guess, rnd_int)
end
end
Overall everything works but the tries at the end of the game remains at 0 not sure where the mistake is.
Perhaps the code could look like following (just a suggestion)
def check(attempts,guess,number)
puts ">>> Attempts [#{attempts}]: guess higher" if guess < number
puts ">>> Attempts [#{attempts}]: guess lower" if guess > number
if guess == number
puts "Winner!!!"
return true
end
return false
end
if __FILE__ == $0
win = false
attempts = 5
puts "
Lets play a game!
I am thinking of a number between 1 and 100
"
number = rand(100)
while not win
print "Your guess: "
guess = gets.chomp.to_i
attempts -= 1
unless attempts
puts "You could not guess right"
exit
end
win = check(attempts, guess, number)
end
end
Output sample
Lets play a game!
I am thinking of a number between 1 and 100
Your guess: 50
>>> Attempts [4]: guess higher
Your guess: 80
>>> Attempts [3]: guess higher
Your guess: 90
>>> Attempts [2]: guess lower
Your guess: 86
Winner!!!
The code could be of following shape
win = false
attempts = 5
puts "
Lets play a game!
I am thinking of a number between 1 and 100
"
number = rand(100)
while not win
print "Your guess: "
guess = gets.chomp.to_i
attempts -= 1
score = guess <=> number
win = true if score == 0
puts "Attempts [#{attempts}]: guess higher" if score < 0
puts "Attempts [#{attempts}]: guess lower" if score > 0
unless attempts > 0
puts "You could not guess it right"
exit
end
end
puts "You are winner!!!"
Utilizing <=> operator the code would be shaped as following
attempts = 5
puts "
Lets play a game!
I am thinking of a number between 1 and 100
"
number = rand(100)
while true
print "Your guess: "
guess = gets.chomp.to_i
attempts -= 1
case guess <=> number
when 0
puts "\n>>> Nice guess, you are winner!!!"
exit
when -1
puts "Attempts [#{attempts}]: guess higher" if attempts > 0
when 1
puts "Attempts [#{attempts}]: guess lower" if attempts > 0
end
unless attempts > 0
puts "\n>>> Sorry, you could not guess it right"
exit
end
end
Is there a way to make this code shorter and simpler?
loop do
if possibleSet.split(" ").map(&:to_i).any? {|e| (e<0 || e>12)}
print "Please enter valid numbers (between 1 and 12): "
possibleSet = gets
errorinput = false
else
errorinput = true
end
break if errorinput
end
Refactored a bit :)
loop do
print "Please enter valid numbers (between 1 and 12): "
possibleSet = gets.chomp
break unless possibleSet.split(" ").map(&:to_i).any? {|e| (e<0 || e>12)}
end
The code below will check input for correctness:
input = loop do
print "Please enter valid numbers (between 1 and 12): "
# ⇓⇓⇓ as many spaces as user wants
input = gets.chomp.split(/\s+/).map(&:to_i) rescue []
break input unless input.empty? || input.any? { |i| !(0..12).include? i }
end
This parses the user input in an array (not exactly the same behavior, but I hope it is cleaner and you can work from there)
set = []
until set.all? {|i| (1..11).include?(i) } && !set.empty? do
set = gets.split(' ').map(&:to_i)
end
I'm having a problem with my ruby script. If anyone could help, I'd really appreciate it. The problem is that the number is stuck between 1-2; where 2 is too high and 1 is too low. The guesses should be integers only.
#!/usr/bin/ruby
def highLow(max)
again = "yes"
while again == "yes"
puts "Welcome to the High Low game"
playGame(max)
print "Would you like to play again? (yes/no): "
again = STDIN.gets.chomp
if again == 'no'
puts "Have a nice day, Goodbye"
end
end
end
#This method contains the logic for a single game and call the feedback method.
def playGame(max)
puts "The game gets played now"
puts "I am thinking of a number between 1 and #{max}." #It show what chosen by user
randomNumber = rand(max)+ 1
print "Make your guess: "
guess = STDIN.gets.chomp
feedback(guess, randomNumber)
end
#Start while loop
#Logic for feedback method. It's ganna check the guess if it's high or low.
def feedback(guess, randomNumber)
count = 1
while guess.to_i != randomNumber
count = count + 1
if guess.to_i < randomNumber
print "That's too low. Guess again: "
else
print "That's too high. Guess again: "
end
guess = STDIN.gets.chomp
end
puts "Correct! You guessed the answer in #{count} tries!"
end
highLow(ARGV[0])
Change your last line to this:
highLow(ARGV[0].to_i)
The ARGV array contains all the passed in arguments as strings, so you have to cast it to integer.
So i have been learning ruby as of late and i am working on this code for practice purposes but i cannot seems to be able to solve this problem any help would be appreciate it.
This is are the guidelines i am following:
clear the screen
greet the player
explain the rules of the game to the player
generate a random number between 0 and x (x being a variable that can be set to any integer)
allow the player n number of guesses (n being a variable)
keep track of the guess history
don't count repeated guesses against the player
congratulate the player when he/she guesses correctly
alert the player when there is only one guess remaining
print the guess history at the end of the game
count number of games won IN A ROW
count number of games won in total
congratulate the play on 3 games won IN A ROW
ask if the player wants to play again
thank the player for playing games if the number of games played is greater than 2
please keep in my that this is work in progress and i have not completed all the guideline, however my questions is with one particular part of it.
here is the code:
guess = Array.new
puts guess.class
def ask()
puts "Please answer in a 'y' or 'n' only!"
puts "Would like to play again?"
end
def guess_check_against()
g = guess.last
unless guess.include?(g) != guess
count+=1
else
puts "sorry you have guessed that number before, Guess Again: "
guess << gets.to_i
count+=1
end
end
puts "what is your name?"
user= gets.chomp
puts "Hello #{user}!!"
max_user_attempts = 4
#attempt_counter = 0
directions = "\nLets play a guessing game! You have
#{max_user_attempts.to_s} guesses before you lose."
print directions
g = guess.last
win = 0
count = 0
play = true
while play == true
puts "Please tell me the max value of the random number: "
max= gets.to_i
num= rand(max)
puts "Ok. The random number is generated between 1 and " + max.to_s + "."
puts "Make your guess: "
guess << gets.to_i
guess_check_against()
#attempt_counter+=1
while guess != num && play != false
if g > num && #attempt_counter < max_user_attempts
print "That's too high. Guess again: "
guess << gets.to_i
guess_check_against()
#attempt_counter+=1
elsif g < num && #attempt_counter < max_user_attempts
print "That's too low. Guess again: "
guess << gets.to_i
guess_check_against()
count+=1
#attempt_counter+=1
else
break
end
end
if #attempts_counter >= max_user_attemtps
puts "Sorry! you lost! Try Again"
break
else #attempts_counter <= max_user_attempts
puts "Correct! You guessed the answer in " + count.to_s + " tries!"
win+=1
end
if win >= 3
puts "Congratulation! you have #{win} number of games in a row"
ask()
answer = gets.chomp!
elsif win < 3
ask()
answer = gets.chomp!
else
break
end
if answer == 'n'
play = false
break
end
if answer == 'y'
play = true
count = 0
end
end
puts "Ok. Goodbye!!"
and here is the error i keep receiving when i try to run this program:
guessing_game.rb:12:in `guess_check_against': undefined local variable or method `guess' for main:Object (NameError)
from guessing_game.rb:45:in `<main>'
when i try to use irb to run the same scenario it works completely fine.
i can not figure out what i am doing wrong, please help!!
The method definition
def guess_check_against()
g = guess.last
...
end
has its own scope, and the local variable
guess = Array.new
that you defined outside of it, is not accessible inside the method definition. guess is not defined inside the method definition. You can change the code so that the method takes that as an argument, and it will become accessible.
I'm trying to write a simple high-low program that will output like this:
$ ./highlow.rb
Please tell me the max value of the random number: 100
Ok. The random number is generated between 1 and 100.
Make your guess: 50
That's too low. Guess again: 75
That's too high. Guess again: 63
That's too low. Guess again: 68
Correct! You guessed the answer in 4 tries!
Would you like to play again? no
OK. Goodbye.
$
This is the code I have, but I'm going wrong somewhere. It appears to work sometimes:
count=0
play = true
while play = true
print "Please tell me the max value of the random number: "
max= gets.to_i
num= rand(max)
puts "Ok. The random number is generated between 1 and " + max.to_s +
"."
print "Make your guess: "
guess=gets.to_i
while guess != num && play != false
if guess > num
print "That's too high. Guess again: "
guess=gets.to_i
count+=1
end
if guess < num
print "That's too low. Guess again: "
guess=gets.to_i
count+=1
else
break
end
end
puts "Correct! You guessed the answer in " + count.to_s + " tries!"
print "Would you like to play again? "
answer=gets.chomp!
if answer == 'n'
play = false
break
end
if
answer == 'y'
play = true
end
end
puts "OK. Goodbye"
Any suggestions? Where am I going wrong?
I think your problem (the one I can see anyway) is with number checking code.
If guess is greater than num, then the first if statement will execute, but then the second one will redirect to the else, breaking out of the loop.
You need to use an elsif. Try changing it to this:
if guess > num
print "That's too high. Guess again: "
guess=gets.to_i
count+=1
elsif guess < num
print "That's too low. Guess again: "
guess=gets.to_i
count+=1
else
break
end