Functions & Procedures

The main difference between procedures and functions is

• Procedures are usually longer and have more instructions

• Functions use parameter passing, while procedures don’t

• Functions are more difficult to debug

• Functions return values, while procedures don’t

The advantages of parameter passing don’t include this

• The same subprogram can be reused in more cases

• Parameter passing makes it easier to use global variables

• More flexible coding

• Can cut down on the use of wasteful global variables

Converting procedures to functions usually causes these effects

• Shorter code

• Slows the program down

• Reduction of the number of global variables, more parameter passing

• Makes it more difficult to use selection

Trying to use a local variable from outside its scope will cause

• A global variable to be overwritten by it

• A wrong procedure to run

• A crash with a report “Unknown variable”

• A logical error

When a variable first appears outside any subprograms

• It is a global variable

• It is a local variable

• It is a parameter variable

• It is not a valid variable

What term is used to describe data passed into/out of a program?

• Variable

• Loop

• Constant

• Parameter

What is a procedure?

• A small section of code within a program which performs a task
• Code which produces a calculated result

If a variable has "global scope" it can be

• used anywhere in the program

• only used outside of a function

• only used inside of a function

• used outside of the program

If a variable has "local scope" it is available for use outside of its function.

• TRUE

• FALSE

What does the term 'debug' mean?

• Identify errors and fix them.
• Making a calculation
• A set of instructions
• Looking at code