[RESOLVED] randomize ( )

[Zulfi Khan2]

Hi,
Is there any randomize ( ) function in Visual C++ 6.0? What is its prototype? Plz guide me.

Zulfi.

[VictorN]

Wow! being here since 1999 and cannot use MSDN yet?
http://msdn.microsoft.com/en-us/libr...(v=vs.60).aspx

[Zulfi Khan2]

Hi,
Thanks for your response. I usually check google because it provides example code also. I found following link from MSDN but it does not even tell me its prototype.
http://msdn.microsoft.com/en-us/library/dd354946.aspx

The link you have provided tells me about random function. I am looking for randomize().
I have tried stdlib.h and ctime.h but its still saying undeclared identifier. Plz guide me.

I have following header files included in my code:

#include "stdafx.h"
#include "LaserGraph.h"

#include "LaserGraphDoc.h"
#include "LaserGraphView.h"
#include <stdlib.h>
#include <time.h>
#include <iostream.h>
#include <math.h>
//#include "time.h"

Last 4 are added just for randomize().
Zulfi.

[Vanaj]

Hi,
Thanks for your response. I usually check google because it provides example code also. I found following link from MSDN but it does not even tell me its prototype.
http://msdn.microsoft.com/en-us/library/dd354946.aspx

The link you have provided tells me about random function. I am looking for randomize().
I have tried stdlib.h and ctime.h but its still saying undeclared identifier. Plz guide me.

I have following header files included in my code:



Last 4 are added just for randomize().
Zulfi.

You asked for a randomize function for VC++ 6.0...the link Victor gave you is for that exact function, it is called srand(), and NOT randomize(), there is no such function for VC++ 6.0...his link also gave you the prototype and example code.

[Zulfi Khan2]

Hi,
Thanks for your information.

Zulfi.

[OReubens]

Note: rand() is pretty much unusable for any but the most simplistic usage cases.

it's period is too short
the generated bits per random number are small
it's cryptographically unsafe
it's too predictable (you can derive the seed from a single output)
it has poor dimensional distribution (it's "unstable", causes streaky artefacts)

The fact it's uniform over 32k, with 32k period and 32k values means it's output isn't even technically "random" because it's impossible to ever get the same 15bit value in succession.



You're much better off using the random features from the C++ <random> header.
hint: the mersenne twisters are very good random number generators.