18. WMLScript Float Standard Library

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WMLScript's Float standard library contains a number of functions for performing floating-point arithmetic operations. Note that the Float standard library is only available on mobile devices that support floating-point arithmetic operations. To check whether a mobile device supports floating-point operations, use the float() function of the Lang standard library. If a mobile device does not support the Float standard library, a call to any of its functions will return invalid.

In the following sections, we will look at some of the more commonly used functions in the Float standard library.


18.1. Rounding a Numeric Value: round() Function

The round() function of the Float standard library returns the rounding of a numeric value. If any error occurs, it returns invalid. The following WMLScript example demonstrates its use:


w = Float.round(10.4);
x = Float.round(10.5);
y = Float.round(-10.5);
z = Float.round(10);


After the execution of the above script, w has the integral value 10, x has the integral value 11, y has the integral value -10 and z has the integral value 10.


18.2. Truncating the Fractional Part of a Numeric Value: int() Function

The int() function of the Float standard library is used to truncate the fractional part of a numeric value. If any error occurs, it returns invalid. The following WMLScript example demonstrates the use of the int() function:


w = Float.int(10.4);
x = Float.int(10.5);
y = Float.int(-10.5);
z = Float.int(10);


After the execution of the above script, w and x contain the integral value 10, y contains the integral value -10 and z contains the integral value 10.


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