Parallax BASIC Stamp 2e, Programming Manual

Page: 68 / 353

BASIC Stamp Architecture – SQR
Page 66
•
BASIC Stamp Programming Manual 2.0b
•
www.parallaxinc.com
To convert brads to degrees, multiply by 180 then divide by 128. To
convert degrees to brads, multiply by 128, then divide by 180. Here’s a
small program that demonstrates the SIN operator:
Degr VAR WORD ' Define variables.
Sine VAR WORD
FOR Degr = 0 TO 359 STEP 45 ' Use degrees.
Sine = SIN (Degr * 128 / 180) ' Convert to brads, do SIN.
DEBUG "Angle: ", DEC Degr, TAB, "Sine: ", SDEC Sine, CR ' Display.
NEXT
The Square Root operator (SQR) computes the integer square root of an
unsigned 16-bit number. (The number must be unsigned since the square
root of a negative number is an ‘imaginary’ number.) Remember that most
square roots have a fractional part that the BASIC Stamp discards when
doing its integer-only math. So it computes the square root of 100 as 10
(correct), but the square root of 99 as 9 (the actual is close to 9.95).
Example:
DEBUG SQR 100 ' Display square root of 100 (10).
DEBUG SQR 99 ' Display of square root of 99 (9 due to truncation)
Table 4.6 lists the available Binary (two-argument) Operators.
Operator Description Supported By:
+ Addition All
- Subtraction All
* Multiplication All
** Multiplication (returns upper 16-bits) All
*/ Multiply by 8-bit integer, 8-bit fraction All except BS1
/ Division All
// Modulus (Remainder of division) All
MIN Limits a value to a specified low All
MAX Limits a value to a specified high All
DIG Returns specified digit of number All except BS1
<< Shift bits left by specified amount All except BS1
>> Shift bits right by specified amount All except BS1
REV Reverse specified number of bits All except BS1
& Bitwise AND All
| Bitwise OR All
^ Bitwise XOR All
&/ Logical AND NOT Only BS1
|/ Logical OR NOT Only BS1
^/ Logical XOR NOT Only BS1
2
e
2
sx
2
p
2
S
QUARE
R
OOT
: SQR
B
INARY
O
PERATORS
.
Table 4.6: Binary Operators. Note:
some binary operators are not
supported by all BASIC Stamps.