BASIC stamp manual v2.2

BASIC Stamp Architecture – MIN, MAX

Page 116 • BASIC Stamp Syntax and Reference Manual 2.2 • www.parallax.com

MIN works in positive math only; its comparisons are not valid when

used on two’s complement negative numbers, since the positive-integer

representation of a number like -1 ($FFFF or 65535 in unsigned decimal) is

larger than that of a number like 10 ($000A or 10 decimal). Use MIN only

with unsigned integers. Because of the way fixed-size integers work, you

should be careful when using an expression involving MIN 0. For

example, 0-1 MIN 0 will result in 65535 because of the way fixed-size

integers wrap around.

SYMBOL value1 = W0

SYMBOL value2 = W1

FOR value1 = 100 TO 0 STEP -10 ' Walk value1 from 100 to 0

value2 = value1 MIN 50 ' Use MIN to clamp at 50

DEBUG value2 ' Show "clamped" value

-- or --

value VAR Word

FOR value = 100 TO 0 STEP 10 ' Walk value from 100 to 0

DEBUG ? value MIN 50 ' Show value1, use MIN to clamp at 50

The Maximum operator (MAX) limits a value to a specified 16-bit positive

maximum. The syntax of MAX is:

value MAX Limit

Where value is a constant or variable value to perform the MAX function

upon and limit is the maximum value that value is allowed to be. Its logic

is, ‘if value is greater than limit, then make result = limit; if value is less than

or equal to limit, make result = value.’ MAX works in positive math only;

its comparisons are not valid when used on two’s complement negative

numbers, since the positive-integer representation of a number like -1

($FFFF or 65535 in unsigned decimal) is larger than that of a number like

10 ($000A or 10 decimal). Use MAX only with unsigned integers. Because

of the way fixed-size integers work, you should be careful when using an

expression involving MAX 65535. For example, 65535+1 MAX 65535 will

result in 0 because of the way fixed-size integers wrap around.

All

MAXIMUM: MAX