DelphiBasics
Random
Function
Generate a random floating point or integer number System unit
1  function Random : Extended;
2  function Random ( LimitPlusOne : Integer ) : Integer;
Description
The Random function generates random numbers. They can be floating point numbers in the range :
 
0 <= Number < 1.0
 
or integer numbers in the range :
 
0 <= Number < LimitPlusOne
 
Delphi uses a pseudo random number generator that always returns the same sequence of values (232) each time the program runs.
 
To avoid this predictability, use the Randomize procedure. It repositions into this random number sequence using the time of day as a pseudo random seed.
Related commands
Randomize Reposition the Random number generator next value
RandomRange Generate a random integer number within a supplied range
RandSeed Reposition the Random number generator next value
 Author links

 Buy Website Traffic at
 Buywebsitetrafficexperts.com

 Buy Proxies at
 Buyproxies.io
 
 Download this web site as a Windows program.




 
Example code : Generate sets of floating point and integer numbers
var
  float : single;
  int   : Integer;
  i     : Integer;

begin
  // Get floating point random numbers in the range 0 <= Number < 1.0
  for i := 1 to 5 do
  begin
    float := Random;
    ShowMessage('float = '+FloatToStr(float));
  end;

  ShowMessage('');

  // Get an integer random number in the range 1..100
  for i := 1 to 5 do
  begin
    int := 1 + Random(100);    // The 100 value gives a range 0..99
    ShowMessage('int = '+IntToStr(int));
  end;
end;
Show full unit code
   float = 2.3283064365387E-10
   float = 0.031379981256104
   float = 0.861048460006714
   float = 0.202580958604813
   float = 0.2729212641716
  
  
   int = 68
   int = 32
   int = 17
   int = 38
   int = 43
 
Delphi Programming Neil Moffatt 2002 - 2017. All rights reserved.  |  Home Page