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The Float LibraryThis library includes a set of typical arithmetic functions that are normally part of the JavaScript language. The support of this library is optional. It is implemented only by devices that can support floating-point numbers. All functions should return
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| Syntax | int(value) |
| Parameters | value = Number |
| Returns | Integer or invalid |
| Examples: | var a = Float.int(9.53); // a = 9var b = Float.int("foobar"); // b = invalid |
floor()This function returns the greatest integer value that is not greater than the given value.
| Syntax | floor(value) |
| Parameters | value = Number |
| Returns | Integer or invalid |
| Examples: | var a = Float.floor(9.53); // a = 9var b = Float.floor(-9.53); // b = -10var c = Float.floor("foobar"); // c = invalid |
ceil()This function returns the smallest integer value that is not smaller than the given value.
| Syntax | ceil(value) |
| Parameters | value = Number |
| Returns | Integer or invalid |
| Examples: | var a = Float.floor(9.13); // a = 10var b = Float.floor(-9.53); // b = -9var c = Float.floor("foobar"); // c = invalid |
pow()This function returns the result of raising the first parameter to the power of the second parameter. If the first parameter is negative, the second parameter must be an integer. Otherwise, invalid is returned. The result is implementation-dependent.
| Syntax | pow(value1, value2) |
| Parameters | value1 = Number value2 = Number |
| Returns | Floating-point number or invalid ((if value1 == 0 and value2 < 0) or (if value1 < 0 and value2 is not an integer)) |
| Examples: | var a = Float.pow(4, 2); // a = 16var b = Float.pow(-2, 3); // b = 8var c = Float.pow(-2, -3); // c = invalidvar d = Float.pow(-2, "foobar"); // d = invalid |
round()This function returns the closest integer value. If two integer numbers are equally close, the larger one is returned.
| Syntax | round(value) |
| Parameters | value = Number |
| Returns | Integer or invalid |
| Examples: | var a = Float.round(9.5); // a = 10var b = Float.floor(-9.53); // b = -9 |
sqrt()This function returns the square root of the given value. The result is implementation-dependent. invalid is returned if the parameter is negative or not a number.
| Syntax | sqrt(value) |
| Parameters | value = Floating-point number |
| Returns | Floating-point number or invalid |
| Examples: | var a = Float.sqrt(4); // a = 2var b = Float.sqrt(6.25); // b = 2.5var c = Float.sqrt("-8"); // c = invalid |
maxFloat()This function returns the maximum floating-point number supported by single-precision floating-point format.
| Syntax | maxFloat() |
| Parameters | none |
| Returns | Floating-point number(3.40282347E+38) |
| Examples: | var a = Float.maxFloat(); // a = 3.40282347E+38 |
minFloat()This function returns the minimum floating-point number supported by single-precision floating-point format.
| Syntax | minFloat() |
| Parameters | none |
| Returns | Floating-point number (1.17549435E-38) |
| Examples: | var a = Float.minFloat(); // a = 1.17549435E-38 |
Next: How to use String library - Part I
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Created: June 5, 2000
Revised: June 5, 2000
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