Mul.v
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Revision as of 17:23, 11 April 2019 by Andrew Korson (talk | contribs) (Created page with "The '''mul.v''' command multiplies two variables and stores the result in the first. == Syntax == mul.v(var vA, var vB);<br /> vA = vA * vB;<br />...")
The mul.v command multiplies two variables and stores the result in the first.
Syntax
mul.v(var vA, var vB);
vA = vA * vB;
vA *= vB;
Remarks
Because variables are 8 bit unsigned numbers, if the result of the multiplication exceeds 255, the result 'wraps around'. For example, if v50 currently equals 200, and v51 equals 3, the statement:
mul.v(v50, v51);
will result in a value for v50 of 88 (200 * 3 = 600; 600 - 512 = 88). This can be represented mathematically as vA = (vA * vB) mod 256.
Note that this command uses the 'dot' notation (i.e. mul.v vs. mulv) unlike the original set of mathematical commands.
Possible Errors
None.
Example
Code:
v50 = 40;
v51 = 5;
mul.v(v50, v51); [ v50 now equals 200
v50 = v50 * v51; [ v50 now equals 232 (1000 - 256 * 3)
v50 *= v51; [ v50 now equals 136 (1160 - 256 * 4)Technical Information
| Required Interpreter Version: | Available in version 2.411 and above. |
| Byte-Code Value: | 166 (0xA6 hex) |
