Re^5: [Homework Question] Subroutines & References

I would state it slightly differently. The function returns nothing different when it is passed no parameters because it takes no parameters — or more precisely, it does nothing with any parameters it may be passed. The array @list_of_numbers is accessed (not declared) within the function. This treats the array as a global variable (even though technically it is lexical). I notice other instances of such access in your functions. Accessing a mutable global (as opposed to a constant) within a function is generally considered a Bad Thing, and is officially Frowned Upon. You have been warned.

Give a man a fish: <%-(-(-(-<

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Re^6: [Homework Question] Subroutines & References by Hayest (Acolyte) on Feb 11, 2015 at 19:48 UTC
Which is why when I add `use strict;` it gives me errors? How would I go about making my variables constant rather than mutable global within a function? I would prefer not to be entangled with Bad Things or Frowned Upon.	[reply] [d/l]
Re^7: [Homework Question] Subroutines & References by AnomalousMonk (Archbishop) on Feb 11, 2015 at 20:38 UTC
... when I add `use strict;` it gives me errors ... I don't know the current state of your code and so cannot say why it will not compile with `use strict;` What do the error messages say? How would I go about making my variables constant rather than mutable global ... Variables (that actually vary) are good. The point is to use variables that have as narrow a scope as (reasonably) possible. This practice will save you a lot of programming grief. Declaring variables at the top of your program and then accessing them deep within a function is your ticket for a roller-coaster ride to Hell. Another parenthetic thought: the statements `print above_mean(@list_of_numbers);` or `print above_mean();` from the code above print the value returned by a call to `above_mean()`, but what does this function actually return? Is it anything useful? (IOW: The function already prints a bunch of stuff during its execution, what's the point of printing its return value, whatever it may be?) Give a man a fish: `<%-(-(-(-<`	[reply] [d/l] [select]