Bitwise Operators

ZX Basic allows Bit Manipulation (bitwise), on every integer type (from 8 to 32 bits).

BITWISE OPERATORS
bAND
bOR
bNOT
bXOR

Except bNOT, all the others require two integral (Byte, Ubyte, Integer, UInteger, Long, ULong) operands. The operation will be applied bit by bit.

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bAND

Performs the Bitwise Conjunction and returns 1 for every bit if and only if both bits are 1.

a	b	result
0	0	0
0	1	0
1	0	0
1	1	1

Example

Binary "mask" that will get only the 4 rightmost bits 0 1 2 3 of a number:

PRINT BIN 01110111 bAND BIN 00001111 will print 3, which is 0111`

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bOR

Performs the Bitwise Disjunction and returns 1 if any of the arguments is 1.

a	b	result
0	0	0
0	1	1
1	0	1
1	1	1

Example

Ensure an ASCII letter is always in lowercase:

PRINT CHR$(CODE "A" OR BIN 10000) will print a because lowercase letters have bit 5 set.

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bNOT

Performs the Bitwise Negation and returns 1 if the arguments is 0 and vice versa. Basically it flips all the bits in an integer number.

a	result
0	1
1	0

Example

Invert the first cell (upper-leftmost) in the screen:

PRINT AT 0, 0; "A";
FOR i = 0 TO 3
    POKE 16384 + 256 * i, bNOT PEEK(16384 + 256 * i)
NEXT

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bXOR

Performs a logical XOR and returns 1 if one and only one of the arguments is 1, 0 if both bits are the same. In essence, returns 1 ONLY if one of the arguments is 1.

a	b	result
0	0	0
0	1	1
1	0	1
1	1	0
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Example

Flips an ASCII letter from lower to uppercase and vice versa

PRINT CHR$(CODE "A" bXOR BIN 10000)