Underscore - QB64Official/qb64 GitHub Wiki
An underscore can be used at the end of a line of code to continue a code line to the next line.
Syntax
IF x + y > 500 AND x + y < 600 THEN _ PRINT x + y
Description
- The underscore can be anywhere after the code on that line to continue the code to the next line in QB64.
 - Multiple underscores can be used for the same line of code.
 - Comments cannot follow an underscore and are not continued on the next line if they end in an underscore.
 - Modern QB64 keywords are preceded by an underscore, unless $NOPREFIX is used. Variables and user procedures names cannot start with a single underscore.
- Variables and user procedures names can be preceded by double underscores if necessary.
 
 - Underscores can be used in the middle of variable, sub procedure or CONST names.
 - In PRINT USING an underscore can precede a formatting character to display that character as literal text in a template STRING.