Commodore Plus 4 - Page 99

BASIC Version 3.5 Commands, Functions, and System Variables 87
1 X is positive
0 X is zero
-1 X is negative
These are the only possible outcomes; they reflect the number's sign, not its
value.
SIN Abbr. si
SIN (number)
The numeric function that finds the sine of the angle in parentheses. The angle
must be expressed in radians. For more information, see the Mathematical
Calculations section of Chapter 3.
Parameter: any number or numeric expression
Examples: PRINT SIHT(7r/S) Prints the sine of an angle of n over 2 radians
1 . (90 degrees).
PRINT SIlT(30*7r/180) Prints the sine of an angle of 30 degrees.
.5
SOUND Abbr. sO
SOUND voice, frequency value, duration
Plays a sound after the VOL command turns on the volume. There are two
voices in the computer, so you can play two-voice harmonies. One of the voices
can be set to make a range of nonmusical noise.
The SOUND command selects the voice, the note to be played, and the length
of
time the note will last.
Parameters: voice number, note value, sound duration
1. There are three possible values for voice number:
1 plays notes in voice 1
2 plays notes in voice 2
3 plays noise in voice 2
The notes played by voice settings 1 and 2 are the same set. If you play different
notes in voices 1 and 2 together, the notes play simultaneously, producing
harmony. If you play notes in the same voice, they play one at a time.