Tandy 1000 Basic Reference Manual

Chapter 10 I BASIC Keywords
SGN
Function
S GN( num her)
Determines number's sign.
If
number is a negative number, SGN returns -1.
If number is a positive number, SGN returns 1.
If number is zero, SGN returns 0.
Examples
Y = SGN<A * E)
determines the sign of the expression A * B, and passes the ap-
propriate number
(-1,0,1) to Y.
Sample Program
610 INPUT "ENTER A NUMBER"; X
620 ON SGNCX) + 2 GOT0 630, 640, 650
630 PRINT "NEGATIVE": END
650 PRINT "POSITIVE": END
640 PRINT "ZERO-: END
305

Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200