Friday, September 11, 2015
On 2015-Sep-11, at 11:00 , Nick Savage <nick.savage@gmail.com> wrote:Okay I started with Learn the hard way with ruby.My code is below and below each code is my question.I guess I do not understand the identifiers because when I do them in my head they dont add up.Any help would be appreciative and the way I learn I can not move on till I know.
This is just barely a Ruby issue. Most operator precedence is the same as you'd expect just from math:
puts "I will now count my chickens:'"puts "Hens #{25 + 30 / 6}"
#how does that equal 30?
25 + (30/6)25 + 530
puts "Roosters #{100 - 25 * 3 % 4}"#How does this equal 97
100 - (25 * 3 % 4)100 - ((25 * 3) % 4) # same precedence, do them left-to-right100 - ( 75 % 4)100 - ( 3 ) # 75 % 4 is the remainder after 75/4100 - 397
puts "Now I will count the eggs:"puts 3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6#How does this equal 7, is it because it is 6.5 and it rounds up.
Here you have to add a fact (behavior) common to many programming languages: "integer division truncates to an integer"
3 + 2 + 1 - 5 + (4%2) - (1/4) + 63 + 2 + 1 - 5 + ( 0 ) - ( 0 ) + 6 # then do the + and - left-to-right5 + 1 - 5 + ( 0 ) - ( 0 ) + 66 - 5 + ( 0 ) - ( 0 ) + 61 + ( 0 ) - ( 0 ) + 61 - ( 0 ) + 61 + 67
Very simple. Perhaps you're over-thinking it?
-Rob
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