Using Hyphens and Underscores

Many SQR commands, such as BEGIN-PROGRAM and BEGIN-SELECT, use a hyphen, whereas procedure and variable names use an underscore.

Procedure and variable names can contain either a hyphen or underscore, but you should use underscores in procedure and variable names to distinguish them from SQR commands. Doing so also prevents confusion when you mix variable names and numbers in an expression, where hyphens could be mistaken for minus signs.