Arithmetic self-operators

Arithmetic self-operators
These operators work only on numeric operands.
The syntax is:

<target> += <right_operand>
<target> -= <right_operand>
<target> *= <right_operand>
<target> /= <right_operand>
<target> %= <right_operand>

<target> must be an existing variable and contain a numeric value. <right_operand> must evaluate to a numeric value. Note that if you want <right_operand> to be a result of an expression, you must enclose it in the $(*) expression evaluation call.
Operator += sums the <right_operand> value to the <target> value and stores the result in <target>.
Operator -= subtracts <right_operand> from <target> and stores the result in <target>.
Operator *= multiplies <target> by <right_operand> and stores the result in <target>.
Operator /= divides <target> by <right_operand> and stores the result in <target>.
Operator %= computes <target> modulus <right_operand> and stores the result in <target>.
The division and modulus operators fail with an error if <right_operand> is 0.
If both <target> and <right_operand> are integer values then the results of the division and modulus are integers (truncated for the division).
If <target> or <right_operand> or both are floating point values then the result is a floating point value.
Examples

    %a=10
    echo %a
    %a+=20
    echo %a
    %a-=$(%a - 1)
    echo %a
    %a *= 10
    echo %a
    %a /= 21
    echo %a
    %a *= 20
    echo %a
    %a /= 21.0
    echo %a
    %b = 10.0
    %a %= %b
    echo %a
    %a = 10
    %b = 3
    # nice trick
    %a /= %b.0
    echo %a

See also
operators


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