&& — Logical AND operator.

Arithmetic operators perform operations of change-sign (negate), don't-change-sign, logical AND logical OR, add, subtract, multiply and divide. Note that a value or an expression may fall between two of these operators, either of which could take it as its left or right argument, as in

a + b * c.

In such cases three rules apply:

1. * and */* bind to their neighbors more strongly than + and −. Thus the above expression is taken as

a + (b * c)

with * taking b and c and then + taking a and b * c.

2. *+* and *−* bind more strongly than &&, which in turn is stronger than ||:

a && b - c || d

is taken as

(a && (b - c)) || d

3. When both operators bind equally strongly, the operations are done left to right:

a - b - c

is taken as

(a - b) - c

Parentheses may be used as above to force particular groupings.

Here is an example of the Logical AND operator. It uses the file *opand.csd*.

**Example 21. Example of the opand opcode.**

See the sections *Real-time Audio* and *Command Line Flags* for more information on using command line flags.

<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o opand.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 kval randomh 0, 1.2, 20 ;choose between 0 and 1.2 if kval >0 && kval<=.5 then ;3 possible outcomes kval = 1 elseif kval >.5 && kval<=1 then kval =2 elseif kval >1 then kval =3 endif printk2 kval ;print value when it changes asig poscil .7, 440*kval, 1 outs asig, asig endin </CsInstruments> <CsScore> f1 0 16384 10 1 i 1 0 5 e </CsScore> </CsoundSynthesizer>

Its output should include lines like these:

i1 0.00000 i1 3.00000 i1 1.00000 i1 3.00000 i1 1.00000 i1 2.00000 i1 3.00000 .....