Board index » cppbuilder » random numbers between 0 and 1

2005-02-09 01:05:34 AM
cppbuilder103
I'm trying to put a simple idea into code, but I keep getting syntactic
errors of one kind or another. The condition I'm trying to code is, in
English:
IF the absolute value of the difference between two random numbers
between 0 and 1 is smaller than a value Maxx, THEN ...
Things I've tried;
float Maxx; if (abs(random-random) < Maxx) ...
float a, b, Maxx; a = random; b = random; if (abs(a-b) < Maxx) ...
Gerrit.
 

On 08 Feb 2005, Gerrit boldly opined:
such value.
G.
 

"Gerrit" < XXXX@XXXXX.COM >wrote in message
you'll need to post some actual code and describe the syntax
errors. From the code that you show, you're testing abs(0) < Maxx.
 

{smallsort}

As Duane already said, i will also suggest to use double instead of float.
Also notice that the random function returns a int, so to get it in the
range between 0 and 1 you need to do something along the lines of
double RandomNumber = random(Resolution) / Resolution
Also be aware that the abs function is for integers and won't work, you
should use fabs instead when dealing for floating point.
/Palle
 

On 08 Feb 2005, Palle Meinert wrote:
Random without an argument returns a real between 0 and 1. Choosing a
large value for Resolution will work fine though.
Gerrit
 

Gerrit < XXXX@XXXXX.COM >wrote:
which returns int values.
Try "fabs" instead - float version of abs.
orphan