Random number generator


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Postby Kresnik Igor » 24 Sep 2016, 03:30

for generating random number i use command a = rand(b). this command get me each time when i run program same equal random number. How i create that i get diferend random number when i run program?
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Kresnik Igor
 
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Joined: 23 Sep 2016, 16:09

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Postby Ursego » 27 Sep 2016, 20:17

Code: Select all
//////////////////////////////////////////////////////////////////////////
// Function: f_BigRand
//
// Description:
// This function uses 2 calls to Rand to generate Random numbers for large
// ranges. It breaks the range into blocks of 32767 (max range for
// RAND function)
// The limit of the function is 32767 blocks of 32767.
// It calls RAND to first determine which block, then calls RAND again to
// determine the number in the
// selected block. To ensure even probability over the range where
//  there are multiple blocks,
// the same sub range is used for each block.
//
// Argument al_range
// The upper limit of the range of random numbers you want returned.
// The lower limit is always 1. The maximum value for the argument is
// 1,073,676,289 or 32767*32767.
//
// Returns
// A random number in the range 1 to al_range inclusive.
// Or 0 if max range exceeded.
//
// Author: David Dennis
//////////////////////////////////////////////////////////////////////////
//
// Revision History
//
// -----------------------------------------------------------------------
// VERSION CHANGE ID WHO WHEN WHAT/WHY
// -----------------------------------------------------------------------
// 6.30 8/4/00 Initial version.
//////////////////////////////////////////////////////////////////////////
Long ll_Offset, ll_Return
Integer li_Range, li_Blocks

// Block size is set to 32767 as this is the maximum range
// the RAND function can handle
Integer li_BlockSize = 32767

IF al_range > 1073676289 THEN
   //Range is too big
   Return 0
END IF

//Determine The number of blocks
li_Blocks = Truncate(al_range/li_BlockSize,0)

//Add an extra block to accommodate any remainder
IF Mod(al_range, li_BlockSize) > 0 THEN
   li_Blocks = li_Blocks + 1
END IF

// Improve efficiency for ranges less than Block Size
// where there is only one block
IF al_range < li_BlockSize THEN
   li_Range = al_range
ELSE
   li_Range = li_BlockSize
END IF

ll_Return = 0

// Loop until the value is in range.
// If the value is not in range, calculate the
// Offset again to ensure even probability
DO UNTIL (ll_Return > 0) And (ll_Return <= al_Range)
   // Calculate a Random Offset using the number
   // of blocks as the range.
   // Offsets will range from [0 to (li_Blocks - 1)*BlockSize]
   // in increments of BlockSize
   ll_Offset = (Rand(li_Blocks) - 1) * li_BlockSize

   //Main Calculation
   ll_Return = ll_Offset + Rand(li_Range)
LOOP

Return ll_Return

http://www.pbdr.com/pbtips/ps/lrgrndnm.htm
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Ursego
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