Manipulating Data Using Methods - Java Programming: Comprehensive Concepts and Techniques - page 160

Table 3-9 Methods from the Math Class

General form: Math.method(arguments)

Purpose: The Math class contains methods for performing basic numeric

operations such as the elementary exponential, logarithm, square
root, and trigonometric functions.

Examples:
METHOD DESCRIPTION EXAMPLE CODE RESULT

abs() Absolute value Math.abs(-75) 75

max() Higher of two numbers Math.max(99,41) 99

min() Lower of two numbers Math.min(99,41) 41

pow() Exponentiation Math.pow(2,5) 32

random() Random number generator Math.random() 0< value >1

round() Rounding to an integer Math.round(27.59) 28

sqrt() Square root Math.sqrt(144) 12

Recall that the values inside the parentheses are the arguments — the pieces
of information the method needs to perform its task. The arguments in most
Math methods can be literals (as in the table examples), variables, or calls to
other methods. The pow() method , used to express exponentiation as in meters
squared, requires two arguments: the base number and the exponent. A comma
separates the arguments.
Perform the following step to enter the formulas.

To Enter the Formulas

1. With the insertion point on line 32 in the coding window, enter the
code from Figure 3-17 on the previous page.
The formulas to convert input values to metric and to calculate the BMI are
entered (Figure 3-18). Line 36 is a blank line.

formulas

pow() method

FIGURE 3-18