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Lesson 10 - Sub programs
3
Global
Local/Global
Global variables can be used anywhere in the program
We can declare a global variable using the global key word
This means that they are accessible from both the main body and the sub programs
Functions
Functions
✳✱*
Variables can be local or global
Any variable used within a sub program is local and can only be called within itself
VERY similar, but functions ALWAYS return a value back to be used in the main program
This means you can use the same variable name as other local variables without any issues
Functions always take at least one parameter
When calling a function we assign it to a variable - otherwise the value returned is lost!
Task
Write a function takes two strings and joins them together with a space in between them.
Call your function and print out the result in the main program
Functions and procedures
With a parameter
Procedures are blocks of code stored under one name
Called by typing their name - sometimes we also pass an argument to them
Lesson Objectives
To know the difference between a function and a procedure
To know the advantages of using sub programs
To use sub programs to solve a problem
Revise, Recap, Review
3 commands used in SQL
2 data types and what they store
1 SQL statement to return all Jaguar 'make' cars from the table 'Cars'
Lesson 10 - Sub programs
Sub program
A mini program within your program
They SAVE TIME if we use repeated code in our program
Type the code out once and give it a name
When you want to use that block of code you just type the name