Arithmetic self-operators

# 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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