Im currently working through the book ‘Learn to Program’ by Chris P.
and I am stuck on one of the exercises. I feel like Im close to the
answer but just cannot quite get it. I appreciate the help. Below is the
program.
What I would like to see is: What is your favorite number? 14 Well this
15 (adding 1) might be better. The error is relating to to_i but Im not
sure where to place it on the num or the +1?
puts ‘What is your favorite number?’
num = gets.chomp
num=num +1
puts ‘Well this ’ + num + ’ might be better.’
What I would like to see is: What is your favorite number? 14 Well
this 15 (adding 1) might be better. The error is relating to to_i
but Im not sure where to place it on the num or the +1?
There are two errors in the script. You need to help Ruby know when
to convert the objects you are working with…
puts ‘What is your favorite number?’
num = gets.chomp
num=num +1
num = num.to_i + 1 # we have a String, but want an Integer
puts ‘Well this ’ + num + ’ might be better.’
now we need to go back to a String so we can concatenate
puts ‘Well this ’ + num.to_s + ’ might be better.’
now we need to go back to a String so we can concatenate
puts ‘Well this ’ + num.to_s + ’ might be better.’
Also, I usually find it more convenient to use string interpolation,
as it implicitly calls the to_s method on the value inside it:
puts “Well this #{num} might be better.”
Another way to do the plus one. Or the next alphabetic character,
is .next
so, you could get pretty crazy with:
num.next
something like so:
puts ‘What is your favorite number?’
num = gets.chomp
puts ‘Well this ’ + num.next + ’ might be better.’
in this case it goes to the next number, as a character, not as a
number, but the result is the same and you don’t need to convert it.
Not always what you want, but pretty nice example of how concise and
convenient Ruby can be.
now we need to go back to a String so we can concatenate
puts ‘Well this ’ + num.to_s + ’ might be better.’
Also, I usually find it more convenient to use string interpolation,
as it implicitly calls the to_s method on the value inside it:
puts “Well this #{num} might be better.”
Me too, but Learn To Program doesn’t teach that (I wish it did!) and
I didn’t want to confuse the issue.
James Edward G. II
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