### 17.2.2. Power Syntax Usage

All lines of power syntax must have an exclamation mark as the first character so that they are not treated as CCL statements. The statements must also end with a semicolon.

Assuming you have a plane named `Plane 1`, the following example returns the area of this plane:

    ! $areaVal = area("Plane 1");
    ! print "The area of Plane 1 is $areaVal \n";

Some subroutines return more than one value. To store return values for a subroutine that returns two variables (such as the `evaluate` function), you could use the following:

    ! ($value, $units) = evaluate('area()@Plane 1');
    ! print "The area of Plane 1 is $value in units of $units \n";

Note: In this case, if single quotes are not used around the expression, `area()@Plane 1`, when calling the function, `evaluate()`, the `@` symbol must be escaped (made literal) using the following power syntax instead:

    ! ($value, $units) = evaluate("area()\@Plane 1");
    ! print "The area of Plane 1 is $value in units of $units \n";

This is used to avoid Perl treating the `@` symbol as a special character. See evaluate(Expression) for details.

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