BlitzMax/Language/Functions

A function is a self contained block of code that can be called from multiple points in your program. Functions are declared using the syntax: Function Identifier : ReturnType ( Parameters ) Function statements... End Function If ReturnType is omitted, the function defaults to returning an Int. Parameters is a comma separated list of parameters for the function. The syntax of each parameter is similar to a variable declaration: Identifier : Type. Function parameters may be used inside a function in the same way as local variables. The Return statement is used to return a value from a function. Here is an example of a simple function that adds 2 integers and returns their sum: Function AddInts:Int( x:Int,y:Int ) Return x+y End Function This function can then be called by other code: Print AddInts( 10,20 ) 'prints 30! Function parameters can be assigned constant 'default values' using syntax similar to initializing a variable: Identifier : Type = ConstantExpression. Default parameters can then be optionally omitted when the function is called: Function IncInt:Int( n:Int,p:Int=1 ) Return n+p End Function Print IncInt( 1 ) 'Prints 2 Print IncInt( 1,3 ) 'Prints 4