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TbcParser.CreateDefaultFuncs method
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Unit
Applies to
Declaration procedure CreateDefaultFuncs ;virtual;
Description CreateDefaultFuncs method creates some predefined functions in the parser's list of functions.
Predefined functions that take one parameter are:
SQR: Square function which can be used as SQR(X)
SIN: Sinus function which can be used as SIN(X), X is a real-type expression. Sin returns the sine of the angle X in radians.
COS: Cosinus function which can be used as COS(X), X is a real-type expression. COS returns the cosine of the angle X in radians.
ATAN: ArcTangent function which can be used as ATAN(X)
SINH: Sinus Hyperbolic function which can be used as SINH(X)
COSH: Cosinus Hyperbolic function which can be used as COSH(X)
COTAN: which can be used as COTAN(X)
TAN: which can be used as TAN(X)
EXP: which can be used as EXP(X)
LN: natural log, which can be used as LN(X)
LOG: 10 based log, which can be used as LOG(X)
SQRT: which can be used as SQRT(X)
ABS: absolute value, which can be used as ABS(X)
SIGN: SIGN(X) returns -1 if X<0; +1 if X>0, 0 if X=0; it can be used as SQR(X)
TRUNC: Discards the fractional part of a number. e.g. TRUNC(-3.2) is -3, TRUNC(3.2) is 3.
CEIL: CEIL(-3.2) = 3, CEIL(3.2) = 4
FLOOR: FLOOR(-3.2) = -4, FLOOR(3.2) = 3
RND: Random number generator.
RND(X) generates a random INTEGER number such that 0 <= Result < int(X). Call TbcParser.Randomize to initialize the random number generator with a random seed value before using RND function in your expression.
RANDOM: Random number generator.
RANDOM(X) generates a random floating point number such that 0 <= Result < X. Call TbcParser.Randomize to initialize the random number generator with a random seed value before using RANDOM function in your expression.
Predefined functions that take two parameters are:
INTPOW: The INTPOW function raises Base to an integral power. INTPOW(2, 3) = 8. Note that result of INTPOW(2, 3.4) = 8 as well.
POW: The Power function raises Base to any power. For fractional exponents or exponents greater than MaxInt, Base must be greater than 0.
LOGN: The LogN function returns the log base N of X. Example: LOGN(10, 100) = 2
MIN: MIN(2, 3) is 2.
MAX: MAX(2, 3) is 3.
Predefined functions that take more than 2 parameters are:
IF: IF(BOOL, X, Y) returns X if BOOL is <> 0, returns Y if BOOL =0. Values of X and Y are calculated regardless of BOOL (Full Boolean Evaluation).
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