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# Javascript Number - toPrecision()

## Description:

This method returns a string representing the number object to the specified precision.

## Syntax:

    number.toPrecision( [ precision ] )

Here is the detail of parameters:

- precision: An integer specifying the number of significant digits.

## Return Value:

Returns a string representing a Number object in fixed-point or exponential notation rounded to precision significant digits.

## Example:

    <html>
    <head>
    <title>JavaScript toPrecision() Method </title>
    </head>
    <body>
    <script type="text/javascript">
       var num = new Number(7.123456);
       document.write("num.toPrecision() is " + num.toPrecision());
       document.write("<br />");

       document.write("num.toPrecision(4) is " + num.toPrecision(4));
       document.write("<br />");

       document.write("num.toPrecision(2) is " + num.toPrecision(2));
       document.write("<br />");

       document.write("num.toPrecision(1) is " + num.toPrecision(1));
    </script>
    </body>
    </html>

This will produce following result:

    num.toPrecision() is 7.123456
    num.toPrecision(4) is 7.123
    num.toPrecision(2) is 7.1
    num.toPrecision(1) is 7

To understand it in better way you can Try it yourself.

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