Pseudocode/Gaddis Pseudocode

Gaddis Pseudocode refers to the pseudocode language described in the book, "Starting Out with Programming Logic and Design", by Tony Gaddis. The language includes elements for variables, named constants, comments, input / output, operators, conditional statements, loops, subroutines, file processing, and classes.

Variables edit

Data Types:

Integer
Real
String
Character

Syntax:

Declare DataType VariableName
Declare DataType ArrayName[Size]

Constants edit

Syntax:

Constant DataType Name = Value

Comments edit

Syntax:

// Comment

Input / Output edit

Syntax:

Input VariableName
Display item, ...
- item must be a variable or literal

Math Operators edit

+ (Add)
- (Subtract)
* (Multiply)
/ (Divide)
MOD (Modulus)
^ (Exponent)

Relational Operators edit

> (Greater than)
< (Less than)
>= (Greater than or equal to)
<= (Less than or equal to)
== (Equal to)
!= (Not equal to)

Logical Operators edit

AND (And)
OR (Or)
NOT (Not)

Conditional Statements edit

If condition Then
    statements
End If

If condition Then
    statements
Else
    statements
End If

Select expression
    Case value:
        statements
    Case value:
        statements
    Default:
        statements
End Select

Loop Statements edit

While condition
    statements
End While

Do
    statements
While condition

Do
    statements
Until condition

For counter = start To end 
    statements
End For

For Each variable In array
    statements
End For

Subroutines edit

Module ModuleName(DataType ParameterName, ...)
    statements
End Module

Function FunctionName(DataType ParameterName, ...)
    statements
    Return value
End Function

Call ModuleName(parameter, ...)
Variable = FunctionName(parameter, ...)

File Processing edit

Declare InputFile VariableName
Declare OutputFile VariableName
Declare OutputFile AppendMode VariableName

Open VariableName FileName
Read VariableName VariableName
Write VariableName item
Close VariableName

Open VariableName FileName
While NOT eof(VariableName)
    statements
End While
Close VariableName

Rename FileName, NewName
Delete FileName

Classes edit

Class ClassName
    Private DataType FieldName
    ...
    Public Module ModuleName(DataType ParameterName, ...)
        statements
    End Module
    ...
    Public Function FunctionName(DataType ParameterName, ...)
        statements
    End Function
    ....
End Class

Declare ClassName VariableName
Set VariableName = New ClassName()

Bibliography edit

Gaddis, T. (2016). Starting Out with Programming Logic and Design, 4th Edition. Pearson. ISBN 9780133998160