Constants
Description
Constants are numbers which cannot be changed after they are defined. For example, 5 will always mean the same number.
In FreeBASIC, a constant definition differs from a variable definition by usage of the Const command.
Such constants are then available globally, meaning that once defined, you can use the word to refer to a constant anywhere in your program.
After being defined with the Const command, constants cannot be altered. If code tries to alter a constant, an error message will result upon code compilation.
Example
Declare Sub PrintConstants ()
Const FirstNumber = 1
Const SecondNumber = 2
Const FirstString = "First string."
Print FirstNumber, SecondNumber 'This will print 1 2
Print FirstString 'This will print First string.
PrintConstants ()
Sub PrintConstants ()
Print FirstNumber, SecondNumber 'This will also print 1 2
Print FirstString 'This will also print First string.
End Sub
Const FirstNumber = 1
Const SecondNumber = 2
Const FirstString = "First string."
Print FirstNumber, SecondNumber 'This will print 1 2
Print FirstString 'This will print First string.
PrintConstants ()
Sub PrintConstants ()
Print FirstNumber, SecondNumber 'This will also print 1 2
Print FirstString 'This will also print First string.
End Sub
See also
