Package com.singularsys.jep.misc.functions

Class Factorial

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.jep.functions.UnaryFunction

com.singularsys.jep.misc.functions.Factorial

All Implemented Interfaces:

PostfixMathCommandI, Serializable

public class Factorial
extends UnaryFunction

Simple implementation of factorial, good up to 20!

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.singularsys.jep.functions.UnaryFunction

UnaryFunction.FunctionWithException<T>

Field Summary

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, description, name, NaN, numberOfParameters

Constructor Summary

Constructors

Constructor	Description
Factorial()

Method Summary

Modifier and Type	Method	Description
Object	eval(Object arg)	Evaluates the factorial function

Methods inherited from class com.singularsys.jep.functions.UnaryFunction

instanceOf, instanceOf, instanceOf, instanceOf, run

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, asType, checkNumberOfParameters, getDescription, getDescription, getDescriptionWithType, getName, getNumberOfParameters, setCurNumberOfParameters, setDescription, setName, toString, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

Factorial

public Factorial()

Method Details

eval

public Object eval(Object arg)
            throws EvaluationException

Evaluates the factorial function

Specified by:

eval in class UnaryFunction

Parameters:

arg - number to find factorial of

Returns:

the factorial as a Long integer

Throws:

EvaluationException - if argument is greater than 20 causing overflow in result