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External Subroutines

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2. External Subroutines. So far, you have been coding internal subroutines; they are a part of the programs by which they are invoked. All in same file, in one CSECT, all parts addressable by all other parts, etc.We sort of put walls between our internal routines, but those walls are made of stra

External Subroutines

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1. 1 External Subroutines External Subroutines (Chapter 6.1-6.4)

Subroutines

Subroutines. reasons for subroutines repeat same code, or similar code with slightly different parameters hide design decisions or design complexity partition off code likely to change provide for separate compilation provide for reuse. Subroutines. Three main concepts involved:

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Flowol subroutines

Flowol subroutines. Subroutines are used to: Simplify your code to make it easier to read (or for someone else to read) Avoid having to write the same block of code a number of times Break a bigger problem into smaller steps. Flowol subroutines.

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APPX Subroutines

APPX Subroutines. Expanding the ways you Develop with APPX . APPX Subroutines. Almost 100 subroutines in 0LA (---) in the following categories : Stream I/O Routines (5) WIDGET Routines (20) RDBMS Routines (8) APPX Desktop Client Routines (9) Conversion Routines (8)

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Subroutines

Subroutines. Thorne : Chapter 8 (Irvine Edition IV : Section 5.5). Subroutines - A sequence of instructions that can be called from various places in the program - Allows the same operation to be performed with different parameters

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Subroutines

Subroutines. Subroutines. aka: user-defined functions, methods, procdures, sub-procedures, etc etc etc We’ll just say Subroutines. “Functions” generally means built-in functions We’ll attempt to start out most basic, and work our way up to complicated. The Basics. sub myfunc{

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Subroutines

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Subroutines

Subroutines. sub &lt;subroutine_name&gt; { #parameters are placed in @_ &lt;code&gt; . . return; }. Scope. You can create local variables using my . Otherwise all variables are assumed global , i.e. they can be accessed and modified by any part of the code.

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Subroutines

Subroutines. A subroutine is a block of code that is called from different places from within a main program or other subroutines. Saves code space in that the subroutine code does not have to be repeated in the program areas that need it; only the code for the subroutine call is repeated.

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Subroutines

Structure of Programming Language. Subroutines. Procedures and Functions. There are two categories of subprograms Function : subroutine that returns a value Procedure : subroutine that does not return a value. Basic Definitions.

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MIPS Subroutines

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Perl Subroutines

Perl Subroutines. Monday, November 14, 2011. Subroutine Basics. To call a subroutine, use the &amp; @_ returns the number of parameters $num_params = @_; @_ contains the actual parameters $_[0], $_[1], … A function can return a value with the return statement

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Perl: subroutines

Perl: subroutines. Hash Example. Codons Use stdin/file re-direction. Outline. String operators and sorting variable scope revisited Subroutines. #!/usr/bin/perl # guessNum.pl # #Example to show STDIN and STDOUT #This will take anything you type, and print it back #to the screen. #

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Subroutines

Subroutines. Q: Why do we need Subroutines?. A: Because we are lazy!. Repeatedly typing out the code for a chore that is used over and over again (or even only a few times) would be a waste of time and space, and makes the code hard to read. Capital letters OK. No semicolon required.

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Subroutines

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Subroutines

Subroutines. Just like C, PERL offers the ability to use subroutines for all the same reasons Code that you will use over and over again Breaking large programs into a series of smaller, more manageable pieces Making programs more readable Making programs easier to test

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Subroutines

Subroutines. Learning objectives. Explain how subroutines help to organise and structure code. Explain the difference between procedures and functions. Explain what variable scope is and the difference between local and global variables. Subroutines: Functions and Procedures.

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Subroutines

Subroutines. Subroutines. aka: user-defined functions, methods, procdures, sub-procedures, etc etc etc We’ll just say Subroutines. &quot;Functions&quot; generally means built-in functions perldoc perlsub. The Basics. sub myfunc { print &quot;Hey, I’m in a function! &quot;; } #… myfunc();

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L9: Subroutines

ECE 2560. L9: Subroutines. Department of Electrical and Computer Engineering The Ohio State University. Subroutines. Subroutines What are they How they can simplify a program An example Stacks Passing data on the stack How subroutine calls use the stack. Stacks.

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Subroutines

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Subroutines

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Subroutines

Subroutines. Harder Problems. Examples so far: sum, sum between, minimum straightforward computation small number of intermediate variables single control structure How do we design algorithms for more complicated problems? complex computation many intermediate variables

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