Viivi Predefined Constants < Predefined Objects < Viivi's Cell < Entrance

Viivi Predefined Constants

Viivi has the following predefined-constants as symbols.

Numerical Constants
When the symbols are used in the S-expressions, they are evaluated to the numerical constants bound to the symbols, respectively.
- MATH-E
  The Bottom of the Natural Logarithm
  The constant value is about
```
	2.718281828459045
```
  (It may be different depending on the environment.)
  Although this constant value is originally an irrational number (the value which cannot be represented by a floating-point number with a finite number of digits), a 64-bit precision approximation in the JVM is used.
- MATH-PI
  The ratio of the circumference of a circle to its diameter
  The constant value is about
```
	3.141592653589793
```
  (It may be different depending on the environment.)
  Although this constant value is originally an irrational number (the value which cannot be represented by a floating-point number with a finite number of digits), a 64-bit precision approximation in the JVM is used.

Symbol Constant
This symbol constant is prepared to help beginners to navigate Viivi with the basic operations in the kernel-mode.
- help
  The value is a string-array including empty lines at the top and at the bottom.
  It shows some basic operations, such as how to exit Viivi, to help the beginners.
  The reason for that the value is not a string but a symbol as well, is that, if a string was used as the value, the double-quotation marks " " are shown at the head and at the tail, respectively, which may confuse the beginners.
  
  Input the symbol help to show the following symbol as the evaluated-value.
```
	(exit)				to exit
	[Control]+[D]			to exit in Unix systems
	[Control]+[Z] [Enter]	to exit in Windows
	(viivi-agreement)		to show agreement
	(viivi-copyright)		to show copyright
	(viivi-version)			to show version number
	(viivi-title)			to show title
	(viivi-help)			to show this help
	help					to show this help
```
Viivi Predefined Constants < Predefined Objects < Viivi's Cell < Entrance

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Exhibited on 2022/03/02
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