06-Return and Math (1).ppt - RETURN VALUES CS 103 BASIC...

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CS 103
BASIC JAVA PROGRAMS
WITH PRINTLN
STATEMENTS
RETURN VALUES

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JAVA'S MATH CLASS
Method name Description
Math.abs( value ) absolute value
Math.ceil( value ) rounds up
Math.floor( value ) rounds down
Math.log10( value ) logarithm, base 10
Math.max( value1 , value2 ) larger of two values
Math.min( value1 , value2 ) smaller of two values
Math.pow( base , exp ) base to the exp power
Math.random()
random double between 0 and 1
Math.round( value ) nearest whole number
Math.sqrt( value ) square root
Math.sin( value )
Math.cos( value )
Math.tan( value )
sine/cosine/tangent of
an angle in radians
Math.toDegrees( value )
Math.toRadians( value )
convert degrees to
radians and back
Constant Description
Math.E
2.7182818...
Math.PI
3.1415926...

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CALLING MATH METHODS
Math. methodName ( parameters )
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Examples:
double squareRoot = Math.sqrt(121.0) ;
System.out.println(squareRoot); // 11.0
int absoluteValue = Math.abs(-50) ;
System.out.println(absoluteValue); // 50
System.out.println( Math.min(3, 7) + 2); // 5
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The Math methods do not print to the console.

Each method produces ("returns") a numeric result.

The results are used as expressions (printed, stored, etc.).

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RETURN

return : To send out a value as the result of a method.

The opposite of a parameter:

Parameters send information in from the caller to the method.

Return values send information out from a method to its caller.