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How do I generate a random number between -2 and -1, and between 1 and 2?

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A.K 2016-6-24

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回答： Walter Roberson 2016-6-24

I can use rand to get a random number between -2 and 2, but I don't want any numbers between -1 and 1. Is there a function that lets me do this?

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Walter Roberson 2016-6-24

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t = rand() * 2 - 1;
r = t + sign(t);

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