## ALP Programming Guide and Reference

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### Description

The following sections describe the elements you use to build an ALP program source file.

Character Set

All elements in an assembler language source file are built from collections of characters contained in the character set, which are defined as:

The uppercase and lowercase letters of the English alphabet
The decimal digits 0 through 9
The following graphic characters:

    ~   !   "   #   $   %   ^   &   '   (   )   |
    *   +   ,   -   .   /   :   ;   =   <   >   ?
    [   \   ]   _   {   }   @

The space and horizontal tab characters
The end of line character(s)

White Space

White space is a character or contiguous stream of characters that is ignored or removed from the input stream by the ALP preprocessor.

White space characters are any contiguous sequence of one or more space or tab characters not enclosed in single or double quotes. White space characters are significant only in that they serve to separate language tokens from one another; they are removed from the input stream by the scanner.