Difference between revisions of "Addv"
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== Remarks == | == Remarks == | ||
− | Because [[variable|variables]] are 8 bit unsigned numbers, if the result of the addition exceeds 255, the result 'wraps around'. For example, if v50 currently equals 200, and v51 has a value of 60, the statement: <CODE>addv(v50, v51);</code> will result in a value for v50 of 4 (200 + 60 = 260; 260 - 256 = 4). This can be represented mathematically as vA = (vA + vB) % 0x100. | + | Because [[variable|variables]] are 8 bit unsigned numbers, if the result of the addition exceeds 255, the result 'wraps around'. For example, if v50 currently equals 200, and v51 has a value of 60, the statement: |
+ | |||
+ | <CODE>addv(v50, v51);</code> | ||
+ | |||
+ | will result in a value for v50 of 4 (200 + 60 = 260; 260 - 256 = 4). This can be represented mathematically as vA = (vA + vB) % 0x100. | ||
== Possible Errors == | == Possible Errors == |
Latest revision as of 21:11, 23 April 2019
The addv command adds the values of two variables, and stores the result in the first variable.
Syntax
addv(var vA, var vB);
vA = vA + vB;
vA += vB;
Remarks
Because variables are 8 bit unsigned numbers, if the result of the addition exceeds 255, the result 'wraps around'. For example, if v50 currently equals 200, and v51 has a value of 60, the statement:
addv(v50, v51);
will result in a value for v50 of 4 (200 + 60 = 260; 260 - 256 = 4). This can be represented mathematically as vA = (vA + vB) % 0x100.
Possible Errors
None.
Example
Code:
v50 = 100; v51 = 100; addv(v50, v51); [ v50 now equals 200 v50 = v50 + v51; [ v50 now equals 44 (300 - 256) v50 += v51; [ v50 now equals 144
Technical Information
Required Interpreter Version: | Available in all AGI versions. |
Byte-Code Value: | 6 (0x06 hex) |