!=
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## !=

!= — Determines if one value is not equal to another.

## Description

Determines if one value is not equal to another.

## Syntax

    (a != b ? v1 : v2)

where a, b, v1 and v2 may be expressions, but a, b not audio-rate.

## Performance

In the above conditional, a and b are first compared. If the indicated relation is true (a not equal to b), then the conditional expression has the value of v1; if the relation is false, the expression has the value of v2.

NB.: If v1 or v2 are expressions, these will be evaluated before the conditional is determined.

In terms of binding strength, all conditional operators (i.e. the relational operators (<, etc.), and ?, and : ) are weaker than the arithmetic and logical operators (+, -, *, /, && and ||).

These are operators not opcodes. Therefore, they can be used within orchestra statements, but do not form complete statements themselves.

## Examples

Here is an example of the != operator. It uses the file notequal.csd.

Example 8. Example of the != operator.

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 notequal.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs  = 1

    instr 1

    ipch   = cpspch(p4)
    iprint = p5
    if (iprint != 1) goto skipPrint
    print  ipch
    asig   vco .7, ipch, 2, 0.5, 1
           outs asig, asig

    skipPrint:

    endin

    </CsInstruments>
    <CsScore>
    f 1 0 65536 10 1	;sine wave

    i1 0 .5 8.00 0
    i1 + .5 8.01 1 ; this note will print it's ipch value and only this one will be played
    i1 + .5 8.02 2

    e
    </CsScore>
    </CsoundSynthesizer>

Its output should include lines like this:

    instr 1:  ipch = 277.167

## See also

Conditional Values

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