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Join Date: Nov 2007
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Junior Poster in Training
Re: C++ Random Numbers hi,
Thanks a lot for posting us this thread it is really valuable
But I wonder if I can make the range including negative values besides positive numbers
e.g: from -1 to 1
if you can help be I'll appreciate it
thanks again
knowledgelover
email removed
Thanks a lot for posting us this thread it is really valuable
But I wonder if I can make the range including negative values besides positive numbers
e.g: from -1 to 1
if you can help be I'll appreciate it
thanks again
knowledgelover
email removed
Last edited by Narue : Nov 30th, 2007 at 5:16 pm.
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The range from -1 to 1 is 2. So get random numbers from 0-2 (rand() % 3 should do that), then subtract 1 from that number. The results should be -1, 0 or 1. Now if you want decimal values, not integer values, ranging from -1 to 1, then a slightly different approach would be needed.
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Junior Poster in Training
oh thanks again
yes I need it to be for decimal and I discovered the approach
it is like this
(2*static_cast<double>(rand())/static_cast<double>(RAND_MAX))-1
right?
it worked for me
thanks again
yes I need it to be for decimal and I discovered the approach
it is like this
(2*static_cast<double>(rand())/static_cast<double>(RAND_MAX))-1
right?
it worked for me
thanks again
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Master Poster
you could however generate positive values and multiply by -1 
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