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Top Forums Programming How to set constrain on random numbers in c Post 302157424 by ahjiefreak on Thursday 10th of January 2008 11:55:27 PM
Old 01-11-2008
Hi,

I get the idea now. Thanks. But i just have a thought if that is the case, would it be very bias to have the top variables always get the most of the values rather than the bottom ones?

What I expected at the first place is to have fair distribution of cake among the variables.

let say i have only consider 3 possbile values, (0,1 and 2). And have 5 variables. If I did consider the below idea, in all the cases, the second of third variables always get the most rather than the fourth and fifth variable.

Please advise. Thanks..

Rgrds,
Jason
 
Test Your Knowledge in Computers #267
Difficulty: Easy
In 1935, at the age of 22, Alan Turning was elected a fellow of King's on the strength of a dissertation in which he proved the central limit theorem.
True or False?

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RAND(3) 						   BSD Library Functions Manual 						   RAND(3)

NAME
rand, rand_r, srand, sranddev -- bad random number generator LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdlib.h> int rand(void); int rand_r(unsigned *seed); void srand(unsigned seed); void sranddev(void); DESCRIPTION
These interfaces are obsoleted by arc4random(3). The rand() function computes a sequence of pseudo-random integers in the range of 0 to RAND_MAX (as defined by the header file <stdlib.h>). The srand() function sets its argument seed as the seed for a new sequence of pseudo-random numbers to be returned by rand(). These sequences are repeatable by calling srand() with the same seed value. If no seed value is provided, the functions are automatically seeded with a value of 1. The sranddev() function initializes a seed, using the random(4) random number device which returns good random numbers. However, the rand() function still remains unsuitable for cryptographic use. The rand_r() function provides the same functionality as rand(). A pointer to the context value seed must be supplied by the caller. SEE ALSO
arc4random(3), random(3), random(4) STANDARDS
The rand() and srand() functions conform to ISO/IEC 9899:1990 (``ISO C90''). The rand_r() function is as proposed in the POSIX.4a Draft #6 document. BSD
May 25, 1999 BSD

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