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;

getfile.c

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Assignment #17: Due Apr. 2

• p.534: #5.
• Write MIDI Note (On, Off) to text program. It should take 3 hex bytes and out put Type (On or Off), Channel number, Note number, and velocity.

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