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How works Random intern?
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Topic: How works Random intern? (Read 1137 times)
coradi
Full Member
Posts: 148
How works Random intern?
«
on:
January 18, 2019, 10:13:54 pm »
How works the Random function?
Is it the same system as srand() from C?
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AVR8/ARM(STM32)
jamie
Hero Member
Posts: 6130
Re: How works Random intern?
«
Reply #1 on:
January 18, 2019, 10:53:02 pm »
srand in C is not Random in pascal.
Srand in C is RandSeed in Pascal
Random will return any number from 0 to the number you input.
if you call Random without any number then it assumes the value 1.0 and there for the return
value will be any number starting from 0 to .99999999
So you could use that to multiply a REAL number
Result := 10000 * Random;
That will return a number between 0..9.999; and it will come with fractons for example
3.56789 etc
If you supply a number that is not a REAL then it becomes a integer type on return..
Random(100) will return any number from 0 to 99
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The only true wisdom is knowing you know nothing
furious programming
Hero Member
Posts: 858
Re: How works Random intern?
«
Reply #2 on:
January 18, 2019, 11:59:00 pm »
You can check how
Random
works, just use the
Find declaration
option and analyze the code of the
genrand_MT19937
function. It is used by every
Random
function, no matter what data type returns.
«
Last Edit: January 19, 2019, 12:01:15 am by furious programming
»
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Lazarus 3.2 with FPC 3.2.2, Windows 10 — all 64-bit
Working solo on an acrade, action/adventure game in retro style (pixelart), programming the engine and shell from scratch, using Free Pascal and SDL. Release planned in 2026.
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