Newbie question


#1

I am very new to programming “infant new”
and I have a question about a return I am scratching my head over in a
simple program I am writing

here is my code… shouldn’t the return of my method be “true” after
pressing enter and thus end the loop?

while (quit == false)
def check_if_blank input
if(input == ‘’)
quit = true
else
quit = false
end
quit
end
puts ‘Enter a number’
first = gets.chomp
quit = check_if_blank first
first_number.push first.to_i

puts 'good..'
puts 'now enter a number to multiply the first number by'

second = gets.chomp
quit = check_if_blank second
second_number.push  second.to_i
answer.push first_number[(first_number.length) -1] *

second_number[(second_number.length) -1]

puts first_number[(first_number.length) -1].to_s + ' * ' +

second_number[(second_number.length) -1].to_s + ’ = ’ +
answer[(answer.length) -1].to_s
if(first_number.length == 5)
quit = true
end
end


#2

I had to work to make your code run. Here’s the deal. The while loop
is
initialized and then it asks for their input. If their input is
nothing,
then it goes through the rest of the code in the while loop, finishes
the
while loop and then the value quit is checked again. at that point the
value quit == true, and so the loop ends. Does that make sense?

Also, if someone puts in a blank carriage return on the first one and
then a
number on the second, the value continues to be false.


#3

Thank you Jason,
That process had skipped my mind for some reason I thought just
setting the variable to true would kill the loop.
this is my revised code.

My first program without just typing out an example from a book

here we go.

any suggestions on how to clean it up would be great.


first_number = []
second_number = []
answer = []
quit = false

def check_if_blank input
if(input == ‘’)
return true
else
return false
end
end

while (quit == false)
if(quit == false)
puts ‘Enter a number’
first = gets.chomp
first_test = check_if_blank first
if(first_test == false)
first_number.push first.to_i
else
quit = true
end
end
if(first_test == false)
puts ‘…good.’
puts ‘Now enter a number to multiply to the first number’
second = gets.chomp
second_test = check_if_blank second
if(second_test == false)
second_number.push second.to_i
answer.push first_number[(first_number.length) -1] *
second_number[(second_number.length) -1]
puts first_number[(first_number.length) -1].to_s + ’ * ’

  • second_number[(second_number.length) -1].to_s + ’ = ’ +
    answer[(answer.length) -1].to_s
    else
    quit = true

          end
    

    end

    if(second_number.length == 5)
    quit = true
    end
    end

if(second_test == false)
finished = false
amount_of_answers = 0
puts
puts ‘okay now we are going to look at all the questions your asked
and their respective answers’
while(finished != true)
if(amount_of_answers == first_number.length)
finished = true
else
puts first_number[amount_of_answers].to_s + ’ * ’ +
second_number[amount_of_answers].to_s + ’ = ’ +
answer[amount_of_answers].to_s
amount_of_answers += 1
end
end
end


#4

On 2/7/07, Vincent Gabriel F. removed_email_address@domain.invalid wrote:

Thank you Jason,
That process had skipped my mind for some reason I thought just
setting the variable to true would kill the loop.
this is my revised code.

My first program without just typing out an example from a book

here we go.

any suggestions on how to clean it up would be great.

I had a little trouble understanding what your code is supposed to do,
but this code will keep asking you for numbers until you answer with
an empty response (just hit enter)

It shows the equations as you enter them, and then in the end gives
you a summary of the one’s you’ve entered. It does not account for
all possible errors.

Look up String#empty, Array#<<, break, loop, and
Array#each_with_index to understand a bit better what’s going on.

Welcome to Ruby. You might try out http://tryruby.hobix.com as well
as get acquainted with the documentation at http://ruby-doc.org

Glad to see you hacking, newbie or not :slight_smile:

firsts = []
seconds = []
answers = []
loop do
puts ‘Enter a number’
first = gets.chomp
break if first.empty?
firsts << first_number = first.to_i
puts ‘…good.’
puts ‘Now enter a number to multiply to the first number’
second = gets.chomp
break if second.empty?
seconds << second_number = second.to_i
answers << answer = (first_number * second_number)
puts “#{first_number} * #{second_number} = #{answer}”
end

puts ‘okay now we are going to look at all the questions your asked’
answers.each_with_index do |c,i|
puts “#{firsts[i]} * #{seconds[i]} = #{c}”
end


#5

Thanks for the links Gregory!
nice to have a warm welcome instead of a flame
hello world of ruby