Hello Ruby Masters!
I'm attempting to write a very simple guessing game script in an effort to expand my knowledge about the Ruby Language. I'm running ruby on my OpenSuse Linux 10 box at home. I'm typically a web-programmer, but I want to get into something a little more deep.
Here is my little script:
···
----------------
# set the default result
theResult = 0
# create the random number
theNumber = rand(10)
while theResult != 3
print "Guess my number: "
theGuess = gets.to_i
# return key
# 1 = number is lower
# 2 = number is higher
# 3 = number matched!
if theNumber < theGuess
theResult = 1
elseif theNumber > theGuess
theResult = 2
elseif theNumber = theGuess
theResult = 3
end
case theResult
when 1
puts "My number is lower."
when 2
puts "My number is higher."
when 3
puts "You guessed my number!"
end
print "The Result: "
print theResult
print "\n"
print "The Guess: "
print theGuess.class
print "+"
print theGuess
print "\n"
print "The Number: "
print theNumber
print "\n"
end
----------------
and here's my output when I run it:
----------------
utdream@dream:~/ruby_scripts> ruby guess_number.rb
Guess my number: 1
The Result: 0
The Guess: Fixnum+1
The Number: 3
----------------
The result staying at 0 tells me that NONE of my comparisons worked. Can anyone tell me why? I'm sure this is something simple but any help would be appreciated.
Thanks in advance!
Warm regards,
Jordan Michaels
Vivio Technologies
Jordan Michaels wrote:
----------------
# set the default result
theResult = 0
# create the random number
theNumber = rand(10)
while theResult != 3
print "Guess my number: "
theGuess = gets.to_i
# return key
# 1 = number is lower
# 2 = number is higher
# 3 = number matched!
if theNumber < theGuess
theResult = 1
elseif theNumber > theGuess
theResult = 2
elseif theNumber = theGuess
theResult = 3
end
case theResult
when 1
puts "My number is lower."
when 2
puts "My number is higher."
when 3
puts "You guessed my number!"
end
print "The Result: "
print theResult
print "\n"
print "The Guess: "
print theGuess.class
print "+"
print theGuess
print "\n"
print "The Number: "
print theNumber
print "\n"
end
----------------
(there is no elseif kayword but elsif)
It seems to be working for me. You could replace the if/elsif statements with case statement
case
when theNumber < theGuess
# blah
when theNumber > theGuess
# blah
else
# blah
end
lopex
elseif theNumber = theGuess
I guess you mean == here, not =.
Best, Ulrich
Jordan Michaels <jordan@viviotech.net> writes:
elseif theNumber > theGuess
theResult = 2
elseif theNumber = theGuess
elseif is not Ruby... try elsif instead.
furthermore, equality is "==", not "=". Here, you assigns theGuess to
theNumber. This assignment return the value of theGuess, hence always
"true".
and here's my output when I run it:
Strange. If i try to run your script, i get a :
bla.rb:17: undefined method `elseif' for main:Object (NoMethodError)
That's not the case for you ?
···
--
Eric Jacoboni, ne il y a 1444957142 secondes
Hello Ruby Masters!
I'm attempting to write a very simple guessing game script in an effort
to expand my knowledge about the Ruby Language. I'm running ruby on my
OpenSuse Linux 10 box at home. I'm typically a web-programmer, but I
want to get into something a little more deep.
Here is my little script:
----------------
# set the default result
theResult = 0
# create the random number
theNumber = rand(10)
while theResult != 3
print "Guess my number: "
theGuess = gets.to_i
# return key
# 1 = number is lower
# 2 = number is higher
# 3 = number matched!
if theNumber < theGuess
theResult = 1
elseif theNumber > theGuess
theResult = 2
elseif theNumber = theGuess
theResult = 3
end
case theResult
when 1
puts "My number is lower."
when 2
puts "My number is higher."
when 3
puts "You guessed my number!"
end
This is a good place to use symbols -- if nothing else, you won't need
the comments explaining the keys:
if theNumber < theGuess
theResult = :lower
elsif theNumber > theGuess
theResult = :higher
elsif theNumber = theGuess
theResult = :equal
end
case theResult
when :lower
puts "My number is lower."
when :higher
puts "My number is higher."
when :equal
puts "You guessed my number!"
end
···
On 3/4/06, Jordan Michaels <jordan@viviotech.net> wrote:
print "The Result: "
print theResult
print "\n"
print "The Guess: "
print theGuess.class
print "+"
print theGuess
print "\n"
print "The Number: "
print theNumber
print "\n"
end
----------------
and here's my output when I run it:
----------------
utdream@dream:~/ruby_scripts> ruby guess_number.rb
Guess my number: 1
The Result: 0
The Guess: Fixnum+1
The Number: 3
----------------
The result staying at 0 tells me that NONE of my comparisons worked. Can
anyone tell me why? I'm sure this is something simple but any help would
be appreciated.
Thanks in advance!
Warm regards,
Jordan Michaels
Vivio Technologies
--
Bill Guindon (aka aGorilla)
The best answer to most questions is "it depends".
oops it seems I missed this (theNumber = theGuess)
lopex
Eric Jacoboni wrote:
Jordan Michaels <jordan@viviotech.net> writes:
elseif theNumber > theGuess
theResult = 2
elseif theNumber = theGuess
elseif is not Ruby... try elsif instead.
furthermore, equality is "==", not "=". Here, you assigns theGuess to
theNumber. This assignment return the value of theGuess, hence always
"true".
and here's my output when I run it:
Strange. If i try to run your script, i get a :
bla.rb:17: undefined method `elseif' for main:Object (NoMethodError)
That's not the case for you ?
No, it was not the case, but that might have been helpful!
> ruby --version
ruby 1.8.2 (2004-12-25) [i586-linux]
I'm downloading 1.8.4 as I write this. We'll see if that doesn't give me better error messages.
Thanks to all for your support and suggestions! Changing the "elseif" to "elsif" did the trick. The script now works as intended. I agree with a lot of your suggestions about equality (==), and using case instead of if. When programming for clients I make a point to use the most efficient and correct code as possible, but I'm just playing with this at the moment. 
Thanks again. It's nice to have a friendly place to turn to when you have questions!
Warm regards,
Jordan Michaels
Vivio Technologies
You could avoid the symbols if you are prepared to understand the <=> comparison, a short example might be
the_number = rand(10)
loop do
print "Guess my number: "
the_guess = gets or break # hit eof
case the_number <=> the_guess.to_i
when -1
puts "My number is lower"
when 1
puts "My number is higher"
else
puts "You guessed my number"
break
end
end
It may be interesting to see how you can trap "bad" input and generate a useful error message using what comes with Ruby
Mike
···
On 4-Mar-06, at 8:00 PM, Bill Guindon wrote:
On 3/4/06, Jordan Michaels <jordan@viviotech.net> wrote:
Hello Ruby Masters!
I'm attempting to write a very simple guessing game script in an effort
to expand my knowledge about the Ruby Language. I'm running ruby on my
OpenSuse Linux 10 box at home. I'm typically a web-programmer, but I
want to get into something a little more deep.
Here is my little script:
----------------
# set the default result
theResult = 0
# create the random number
theNumber = rand(10)
while theResult != 3
print "Guess my number: "
theGuess = gets.to_i
# return key
# 1 = number is lower
# 2 = number is higher
# 3 = number matched!
if theNumber < theGuess
theResult = 1
elseif theNumber > theGuess
theResult = 2
elseif theNumber = theGuess
theResult = 3
end
case theResult
when 1
puts "My number is lower."
when 2
puts "My number is higher."
when 3
puts "You guessed my number!"
end
This is a good place to use symbols -- if nothing else, you won't need
the comments explaining the keys:
if theNumber < theGuess
theResult = :lower
elsif theNumber > theGuess
theResult = :higher
elsif theNumber = theGuess
theResult = :equal
end
case theResult
when :lower
puts "My number is lower."
when :higher
puts "My number is higher."
when :equal
puts "You guessed my number!"
end
print "The Result: "
print theResult
print "\n"
print "The Guess: "
print theGuess.class
print "+"
print theGuess
print "\n"
print "The Number: "
print theNumber
print "\n"
end
----------------
and here's my output when I run it:
----------------
utdream@dream:~/ruby_scripts> ruby guess_number.rb
Guess my number: 1
The Result: 0
The Guess: Fixnum+1
The Number: 3
----------------
The result staying at 0 tells me that NONE of my comparisons worked. Can
anyone tell me why? I'm sure this is something simple but any help would
be appreciated.
--
Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/
The "`Stok' disclaimers" apply.