Delphi Basics : RandomRange command

DelphiBasics

RandomRange
Function

Generate a random integer number within a supplied range

Math unit

function RandomRange(const RangeFrom, RangeTo Integer):Integer;

Description

The RandomRange function generates a random Integer number within the range RangeFrom to RangeTo inclusively. *

This provides a more convenient version of the System unit Random function.

Both use a pseudo random number sequence of 2³² values. Each time you run your program, the values generated will be the same, unless you reposition the generator to a different part of the sequence using the Randomize or RandSeed functions.

Related commands

Random		Generate a random floating point or integer number
Randomize		Reposition the Random number generator next value
RandSeed		Reposition the Random number generator next value

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Example code : Generate random numbers in a very small range

var
  i : Integer;
begin
  // Show 5 random numbers in the range 652 to 656
  for i := 1 to 5 do
    ShowMessage('Random number : '+IntToStr(RandomRange(652, 656)));
end;

Show full unit code

  Random number = 652
  Random number = 652
  Random number = 655
  Random number = 652
  Random number = 653