I want a function that returns -1 for negative numbers and +1 for positive numbers. http://en.wikipedia.org/wiki/Sign_function It's easy enough to write my own, but it seems like something that ought to be in a standard library somewhere.
Edit: Specifically, I was looking for a function working on floats.
转载于:https://stackoverflow.com/questions/1903954/is-there-a-standard-sign-function-signum-sgn-in-c-c