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Gives val the same sign as signval, and return the result

//Declaration: float copysignf(float val, float signval); double copysign(double val, double signval); long double copysignl(long double val, long double signval); #include <math.h> #include <stdio.h> int main(void) { printf("%f", copysignf(1.0, -2.0)); } /* -1.000000*/