Visual Basic Chapter 7

Address

A variable’s location in memory where its value is stored

Argument

A variable or value passed to a procedure

Class

A data type used to declare an object

Documentation

Comments that describe a procedure and any preconditions or postconditions of the procedure

Function procedure

A procedure that performs a specific task and then returns a value. Also just called a “function”

General procedure

A user-defined Sub procedure

Lifetime

The time in which a variable exists in memory

Parameter

A variable declared in a procedure to accept the value or address of an argument

Pass

Giving data to a procedure

Postcondition

A statement of what must be true at the end of a procedure if the procedure has worked properly. Also just called “post”

Precondition

The initial requirements of a procedure. Also just called “pre”

Procedure

A block of code that performs a specific task. Procedures simplify a program by dividing it up into smaller, more manageable tasks

Reference parameter

A variable declared in a procedure to accept the address of the argument. Reference parameters can alter the value of the variable arguments used in the procedure call

Static variable

A variable with a scope local to the procedure in which it is declared and a lifetime the duration of the program

Sub procedure

A procedure that is an event procedure or a general procedure

Value parameter

A variable declared in a procedure to accept a copy of an argument. Value parameters cannot alter the value of the arguments used in the procedure call

Add Procedure command

Used to add a procedure to the Code Editor window. Found in the Tools menu

ByRef

Keyword used to declare a reference parameter in a general procedure

ByVal

Keyword used to declare a value parameter in a general procedure

Call

Statement used to execute a general procedure

End Function

Statement used to end the Function statement

End Sub

Statement used to end the Sub statement

Function

Statement used to declare a function procedure

LoadPicture

Function used to change the image in an image box

Static

Keyword used in place of Dim to declare a static variable

Sub

Statement used to declare a procedure