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KLELSTDLIB(1)			    libklel			 KLELSTDLIB(1)

INTRODUCTION
       This manual page	documents the standard library of variables and
       functions available for use in KL-EL expressions.  For documentation on
       how to embed the	KL-EL compiler and interpreter in an application, see
       klelapi(3).  For	a tutorial on how to use the library, see kleltut(3).
       For documentation on the	expression language itself, see	klellang(3).

FUNCTIONS
       The following sub-sections describe the various arithmetic, string, and
       time functions exported by the standard library for general use in
       KL-EL expressions.

   ARITHMETIC FUNCTIONS
       int abs(int x);
	   Returns the absolute	value of x.

       int entier(real x);
	   Converts x to an integer, rounding towards negative infinity.

       real real(int x);
	   Converts x to a real	number.

       int max(int x, int y);
	   Returns the larger of x and y.

       int min(int x, int y);
	   Returns the smaller of x and	y.

       bool odd(int x);
	   Returns true	if x is	odd.

   STRING FUNCTIONS
       int cksum(string	x);
	   Computes a simple 16-bit checksum of	x using	the original BSD
	   checksum algorithm.

       string chr(int x);
	   Returns a string containing a single	character whose	character code
	   is equal to x.

       int ord(string x);
	   Returns the character code of the first character of	x.

       int strlen(string x);
	   Returns the length in bytes of x.

       string string_of_bool(bool x);
	   Returns the string "true" if	x is true; otherwise, it returns
	   "false".

       string string_of_real(real x);
	   Returns the string representation of	x in decimal notation.

       string string_of_int(int	x);
	   Returns the string representation of	x in decimal notation.

       string dec_of_int(int x);
	   An alias for	string_of_int.

       string hex_of_int(int x);
	   Returns the string representation of	x in hexadecimal notation.

       string oct_of_int(int x);
	   Returns the string representation of	x in octal notation.

   TIME	FUNCTIONS
       int now();
	   Returns the number of seconds since the epoch.

       string ctime();
	   Returns the current time as reported	by the ctime(3)	function.

   ERROR FUNCTIONS
       int abort_bool(string message);
	   Aborts execution (produces a	runtime	error, causing KlelExecute to
	   return NULL)	with the given message pushed onto the error stack.
	   Does	not return, but	purports to return a boolean, allowing it to
	   be used in boolean expressions.

       int abort_int(string message);
	   As for abort_bool, but purports to return an	integer.

       int abort_real(string message);
	   As for abort_bool, but purports to return an	real number.

       int abort_string(string message);
	   As for abort_bool, but purports to return an	string.

VARIABLES
       The following variables are defined in the standard library:

			     ======= DEFINITION	=======
				     t	d
				     y	e
				     p	s
				     e	c
					r
					i
					p
					t
					i
					o
					n
	  ======   VARIABLE  ==========================
	  true			     B	Boolean	true
	  false			     B	Boolean	false
	  pi			     R	3.1415926535897932384 (approximation)
	  e			     R	2.7182818284590452354 (approximation)

SEE ALSO
       klel-expr(1), klelapi(3), klellang(3), kleltut(3)

1.1.0				  2025-11-01			 KLELSTDLIB(1)

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