Factorial (Jep with extensions API )

java.lang.Object
- com.singularsys.jep.functions.PostfixMathCommand
- - com.singularsys.jep.functions.UnaryFunction
  - - com.singularsys.jep.misc.functions.Factorial

All Implemented Interfaces:

PostfixMathCommandI, java.io.Serializable
```
public class Factorial
extends UnaryFunction
```
Simple implementation of factorial, good up to 20!

See Also:

Serialized Form

- Field Summary
  - Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand
    curNumberOfParameters, name, NaN, numberOfParameters
- Constructor Summary
  
  Constructors
  Constructor Description
  
  Factorial()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  java.lang.Object eval(java.lang.Object arg)
  Evaluates the factorial function
  - Methods inherited from class com.singularsys.jep.functions.UnaryFunction
    instanceOf, instanceOf, run
  - Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand
    asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString, toString
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Factorial
```
public Factorial()
```
- Method Detail
  - eval
```
public java.lang.Object eval(java.lang.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