What is wrong in this code ... ???

[Faisal Raja]

Hello ,
Well Im new to programming in Ruby Language ( Infact only an hour back
i started it ) .

class Student

def initialize(name)

@name = name

end

def show

s = "Name : " + name
return s


end
end


st = Student.new("Abc") ;
st.inspect

I have Windows Xp Sp2 n when i run this program on console , it doesn't
show me anything . There is no error but it is also not shwoing me
anything .

st.inspect should show info
st.to_s also doesn't show anything


if i write st.show
it also doesn't work .
I wuld be thankful if u people help me out
Thanks in advance

 

[Jason Foreman]

Hello ,
Well Im new to programming in Ruby Language ( Infact only an hour back
i started it ) .
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class Student
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def initialize(name)
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@name =3D name
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end
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def show
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s =3D "Name : " + name
return s
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end
end
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st =3D Student.new("Abc") ;
st.inspect
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I have Windows Xp Sp2 n when i run this program on console , it doesn't
show me anything . There is no error but it is also not shwoing me
anything .
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you aren't printing anything. Try putting "p st.inspect" instead of
just "st.inspect".

st.inspect should show info
st.to_s also doesn't show anything
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=20
if i write st.show
it also doesn't work .

this is because you reference 'name' which is a local variable, but
what you meant is to access '@name' which is the instance variable.

Try this instead: s =3D "Name: " + @name

I wuld be thankful if u people help me out
Thanks in advance
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Jason

 

[Jared Richardson]

I'm no Ruby guru (and I'm sure you'll hear from others soon), but if you add

def printName
puts @name
end


then use this

st = Student.new("Abc") ;
#st.inspect
st.printName

you can run it like so:

C:\dev\ruby>student.rb testName
Abc

C:\dev\ruby>

Jared

Ship It! is shipping!
http://www.jaredrichardson.net
http://www.pragmaticprogrammer.com/titles/prj/

 

[Daniel Nugent]

The extra assignment is unnecessary too.

you can just do

def show
return "Name: " + @name
end

With instance and class variables, the @'s are part of the name themselves.

This is a nice thing because you can always tell whether you're
looking at a class variable, a local variable, or an instance
variable.

=20
you aren't printing anything. Try putting "p st.inspect" instead of
just "st.inspect".
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=20
this is because you reference 'name' which is a local variable, but
what you meant is to access '@name' which is the instance variable.
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Try this instead: s =3D "Name: " + @name
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Jason
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--=20
-Dan Nugent

 

[Gavin Kistner]

--Apple-Mail-1-551515356
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
charset=US-ASCII;
delsp=yes;
format=flowed

The extra assignment is unnecessary too.

you can just do

def show
return "Name: " + @name
end

Or, because the last value in a method is the return value (in the
absence of a call to the #return method) you can simply do:

def show
"Name: " + @name
end

or, even better, use string interpolation:

def show
"Name: #{@name}"
end

and finally, because instance variables are special, even:

def show
"Name: #@name"
end

will work.
--Apple-Mail-1-551515356--

 

[Faisal Raja]

Well , p st.inspect worked ... thanks .
What this 'p' represent ??? .... why we need to include it .

 

[Belorion]

Well , p st.inspect worked ... thanks .
What this 'p' represent ??? .... why we need to include it .

st.inspect just returns "... a string containing a human-readable
representation of obj"

You can do whatever you want with that string -- it does not assume
you want to send it to STDOUT.

p st.inspect is short for print st.inspect, which sends the string to STDOU=
T.

Matt

 

[Faisal Raja]

Well I got it . Thanks you every1 , for helping
U people have given me some useful things .

May U all be blessed

 

[Faisal Raja]

Well I got it . Thanks you every1 , for helping
U people have given me some useful things .

May U all be blessed