QB64 is a modern extended BASIC programming language that retains QBasic/QuickBASIC 4.5 compatibility and compiles native binaries for Windows, Linux, and macOS.
The EXIT SUB statement can be used in a SUB routine to exit before the code ends.
Syntax
EXIT SUB
Use EXIT SUB to immediately EXIT a SUB if an undesired condition is created.
EXIT SUB is not the same as END SUB which is required in a SUB procedure.