Specifications

Commands - 28
DEC & DECF
Statements
SYNTAX: DEC variable
DECF variable
PURPOSE: To decrement a variable by one (DEC) or four (DECF).
REMARKS: This is a fast way to decrement a simple or array variable.
A = A–1 slow
DEC A fast
A = A–4 slow
DECF A fast
DEC executes more than twice as fast as the statement it replaces. Valid for simple and array
variables.
RELATED: INC, INCF
EXAMPLE: 10 A = 4
20 DEC A
30 PRINT A
40 DECF A
50 PRINT A
RUN
3
–1
ERROR: <Expected variable> – if parameter is not a variable