DMP - Chapter 15

Bit Fiddling

Signed integers

Two's complement (invert + 1): -1 == 11111111, -128 == 1000000
One's complement (invert only): -1 == 11111110, -0 == 11111111

Octal (e.g. 0377 == 1111111)

Hexadecimal

Bitwise operators: ~, &, |, ^

Masks (&);

Bit on (| MASK), off (| -MASK)

Toggling bits (^ MASK)

Structure contents in a file

Checking the value of a bit (flag & MASK) == MASK

Bitwise shift operators (<<, >>)

Bit fields

struct
{
unsigned bit1: 1;
unsigned bits: 4;
unsigned bit3: 2;
} flag;

Assignment #14 (Due 21 Jan. 1997):

p.534: #1, 3, 4, 5.
Write MIDI Note (On, Off) to text function. It should take 3 hex bytes (use a struct) and output Type (On or Off), Channel number, Note number, and velocity.

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