--- So I managed to write a simple function and use return and puts to display it.

def add(a, b)
puts "ADDING #{a} + #{b}"
return a + b
end

age = add(30, 5)

puts "Age: #{age}"

Display :

CaiGengYangs-MacBook-Pro:GoatBoy CaiGengYang$ ruby ex80.rb
ADDING 30 + 5
Age: 35

--- But when I tried to extend it to (A+B)/C, it display error message :

def add(a, b)
puts "(ADDING #{a} + #{b}) / #{c}"
return (a + b) / c
end

age = add(30, 10) / 5

puts "Age: #{age}"

Display :

CaiGengYangs-MacBook-Pro:GoatBoy CaiGengYang$ ruby ex90.rb
ex90.rb:2:in `add': undefined local variable or method `c' for main:Object (NameError)
from ex90.rb:6:in `<main>''

Any smart person over here ? Help lah ...

Gengyang

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On 19.04.2016 16:06, Cai Gengyang wrote:

--- So I managed to write a simple function and use return and puts to display it.

def add(a, b)
puts "ADDING #{a} + #{b}"
return a + b
end

age = add(30, 5)

puts "Age: #{age}"

Display :

CaiGengYangs-MacBook-Pro:GoatBoy CaiGengYang$ ruby ex80.rb
ADDING 30 + 5
Age: 35

--- But when I tried to extend it to (A+B)/C, it display error message :

def add(a, b)
puts "(ADDING #{a} + #{b}) / #{c}"
return (a + b) / c
end

age = add(30, 10) / 5

puts "Age: #{age}"

Display :

CaiGengYangs-MacBook-Pro:GoatBoy CaiGengYang$ ruby ex90.rb
ex90.rb:2:in `add': undefined local variable or method `c' for main:Object (NameError)
from ex90.rb:6:in `<main>''

Any smart person over here ? Help lah ...

The error message really says it all.

robert


--
remember.guy do |as, often| as.you_can - without end http://blog.rubybestpractices.com/

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This is what I did :

I created a file , defined a new variable c and saved it as ex50.rb ---

def add(a, b, c)
puts "(ADDING #{a} + #{b}) / #{c}"
return (a + b) / c
end

age = add(30, 10) / 5

puts "Age: #{age}"

Then I tried to run it :

CaiGengYangs-MacBook-Pro:~ CaiGengYang$ ruby ex50.rb

But I got this error message :

ruby: No such file or directory -- ex50.rb (LoadError)





On Wednesday, April 20, 2016 at 1:19:26 AM UTC+8, Robert Klemme wrote:

On 19.04.2016 16:06, Cai Gengyang wrote:

--- So I managed to write a simple function and use return and puts to display it.

def add(a, b)
puts "ADDING #{a} + #{b}"
return a + b
end

age = add(30, 5)

puts "Age: #{age}"

Display :

CaiGengYangs-MacBook-Pro:GoatBoy CaiGengYang$ ruby ex80.rb
ADDING 30 + 5
Age: 35

--- But when I tried to extend it to (A+B)/C, it display error message :

def add(a, b)
puts "(ADDING #{a} + #{b}) / #{c}"
return (a + b) / c
end

age = add(30, 10) / 5

puts "Age: #{age}"

Display :

CaiGengYangs-MacBook-Pro:GoatBoy CaiGengYang$ ruby ex90.rb
ex90.rb:2:in `add': undefined local variable or method `c' for main:Object (NameError)
from ex90.rb:6:in `<main>''

Any smart person over here ? Help lah ...

The error message really says it all.

robert

--
remember.guy do |as, often| as.you_can - without end http://blog.rubybestpractices.com/

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What happened to "GoatBoy CaiGengYang"? It seems your other exercise
live in that directory?

Regards,
Sebastian

--
Sebastian (Rudolfo) Christ
http://rudolfochrist.github.io
GPG Fingerprint: 306D 8FD3 DFB6 4E44 5061
CE71 6407 D6F8 2AC5 55DD

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W dniu 2016-04-20 o 07:28, Cai Gengyang pisze:

This is what I did :

I created a file , defined a new variable c and saved it as ex50.rb ---

def add(a, b, c)

a, b and c - three arguments

age = add(30, 10) / 5

then you are calling function with two arguments and divide what
function returns by 5 - really?

And remember, that 7/3 = 2 not 2.333(3) because:
2.2.0 :005 > 7.class

Fixnum

and Fixnum / Fixnum = Fixnum

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Saved it in mystuff directory actually rather than Goatboy.

Never mind ... gonna move on for the time being. (This was just a side issue I suddenly thought of). I wanna complete the entire ebook, then start looking at some open-source code and start making a web-based game.

Are there more Ruby game engines online ?
This is the only one I could find : http://blowmage.com/2015/04/17/writing-games-ruby


On Wednesday, April 20, 2016 at 3:25:17 PM UTC+8, Sebastian Christ wrote:

What happened to "GoatBoy CaiGengYang"? It seems your other exercise
live in that directory?

Regards,
Sebastian

--
Sebastian (Rudolfo) Christ
http://rudolfochrist.github.io
GPG Fingerprint: 306D 8FD3 DFB6 4E44 5061
CE71 6407 D6F8 2AC5 55DD

--- SoupGate-Win32 v1.05
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If you know that you've saved your file in "mystuff", how comes that
you're puzzled by this?

On 2016-04-19 22:28, Cai Gengyang <gengyangcai@gmail.com> wrote:

Then I tried to run it :

CaiGengYangs-MacBook-Pro:~ CaiGengYang$ ruby ex50.rb

But I got this error message :

ruby: No such file or directory -- ex50.rb (LoadError)

--
Sebastian (Rudolfo) Christ
http://rudolfochrist.github.io
GPG Fingerprint: 306D 8FD3 DFB6 4E44 5061
CE71 6407 D6F8 2AC5 55DD

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On 2016-04-20, Sebastian Christ <rudolfo.christ@gmail.com> wrote:

If you know that you've saved your file in "mystuff", how comes that
you're puzzled by this?

#15 ("WACF") in "Academic Programmers: A Spotter's Guide".

http://www.ee.ryerson.ca/~elf/hack/academic.html

(Not implying that the slobbering imbecile is an academic in any way).

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On 2016-04-20, Sebastian Christ <rudolfo.christ@gmail.com> wrote:

On 2016-04-20 14:34, Kaz Kylheku <545-066-4921@kylheku.com> wrote:

On 2016-04-20, Sebastian Christ <rudolfo.christ@gmail.com> wrote:

If you know that you've saved your file in "mystuff", how comes that
you're puzzled by this?

#15 ("WACF") in "Academic Programmers: A Spotter's Guide".

http://www.ee.ryerson.ca/~elf/hack/academic.html

(Not implying that the slobbering imbecile is an academic in any
way).

LOL. Very interesting read ;-) Thanks for the link.

The author was a visionary when writing #19 "What Colour Should That
Be?" Look at the state of the web today. And:

"Always has a more expensive machine than you, usually with a very nice
colour screen, sound card, Dataglove, voice recognition equipment etc. -
and no keyboard ..."

No keyboard! Hello, smartphone, tablet.

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On 2016-04-20 14:34, Kaz Kylheku <545-066-4921@kylheku.com> wrote:

On 2016-04-20, Sebastian Christ <rudolfo.christ@gmail.com> wrote:

If you know that you've saved your file in "mystuff", how comes that
you're puzzled by this?

#15 ("WACF") in "Academic Programmers: A Spotter's Guide".

http://www.ee.ryerson.ca/~elf/hack/academic.html

(Not implying that the slobbering imbecile is an academic in any
way).

LOL. Very interesting read ;-) Thanks for the link.

-Sebastian

--
Sebastian (Rudolfo) Christ http://rudolfochrist.github.io GPG
Fingerprint: 306D 8FD3 DFB6 4E44 5061
CE71 6407 D6F8 2AC5 55DD

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