Delphi Basics : RTL By functionality : NumbersCalcs

Type Name Summary

Function Abs Gives the absolute value of a number (-ve sign is removed)

Function Addr Gives the address of a variable, function or procedure

Keyword And Boolean and or bitwise and of two arguments

Function CompareValue Compare numeric values with a tolerance

Function Copy Create a copy of part of a string or an array

Function DaysBetween Gives the whole number of days between 2 dates

Function DaySpan Gives the fractional number of days between 2 dates

Procedure Dec Decrement an ordinal variable

Keyword Div Performs integer division, discarding the remainder

Procedure Exclude Exclude a value in a set variable

Function Exp Gives the exponent of a number

Procedure FillChar Fills out a section of storage with a fill character or byte value

Function Frac The fractional part of a floating point number

Function Hi Returns the hi-order byte of a (2 byte) Integer

Function High Returns the highest value of a type or variable

Keyword In Used to test if a value is a member of a set

Procedure Inc Increment an ordinal variable

Procedure Include Include a value in a set variable

Function Int The integer part of a floating point number as a float

Function IsInfinite Checks whether a floating point number is infinite

Function IsNaN Checks to see if a floating point number holds a real number

Function Length Return the number of elements in an array or string

Function Lo Returns the low-order byte of a (2 byte) Integer

Function Low Returns the lowest value of a type or variable

Function Max Gives the maximum of two integer values

Function Mean Gives the average for a set of numbers

Function Min Gives the minimum of two integer values

Keyword Mod Performs integer division, returning the remainder

Procedure Move Copy bytes of data from a source to a destination

Function Odd Tests whether an integer has an odd value

Keyword Or Boolean or or bitwise or of two arguments

Function Ord Provides the Ordinal value of an integer, character or enum

Function PointsEqual Compares two TPoint values for equality

Function Pred Decrement an ordinal variable

Function PtInRect Tests to see if a point lies within a rectangle

Function Random Generate a random floating point or integer number

Procedure Randomize Reposition the Random number generator next value

Function RandomRange Generate a random integer number within a supplied range

Variable RandSeed Reposition the Random number generator next value

Function Rect Create a TRect value from 2 points or 4 coordinates

Function Round Rounds a floating point number to an integer

Procedure SetLength Changes the size of a string, or the size(s) of an array

Keyword Shl Shift an integer value left by a number of bits

Keyword Shr Shift an integer value right by a number of bits

Function SizeOf Gives the storage byte size of a type or variable

Function Slice Creates a slice of an array as an Open Array parameter

Function Sqr Gives the square of a number

Function Sqrt Gives the square root of a number

Function Succ Increment an ordinal variable

Function Sum Return the sum of an array of floating point values

Function Trunc The integer part of a floating point number

Keyword Xor Boolean Xor or bitwise Xor of two arguments

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