January 2001
Beginner
312 pages
6h 4m
English
Content preview from JavaScript™ 1.5 by ExampleBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The Math Object
The Math object brings to JavaScript all the basic mathematical function-ality and constants you are likely to need.
Let's look at some examples of the Math object in action.
Using the PI Property
The π constant is one constant (equal to about 3.1415, although the numbers go on forever with the millionth number being a 1!) you might want to use, especially if you deal with circles. π returns the ratio of the circumference of a circle to its diameter. The following shows it in action as a simple circle area calculator using the mathematical formula Pi x r^2 or Pi x r x r (see Figure 9.1):
<script language="JavaScript"> <!-- Cloaking device on! inpRadius = prompt("Enter the radius for your circle","Radius - digits only!"); alert(Math.PI ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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