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#include <math.h> double exp2(double x); |
This function computes 2 to the power of x, 2^x.
2 to the x power. If the value of x is finite, but so large
in magnitude that 2^x cannot be accurately represented by a
double, the return value is is the nearest representable
double (possibly, an Inf), and errno is set to
ERANGE. If x is either a positive or a negative infinity,
the result is either +Inf or zero, respectively, and errno
is not changed. If x is a NaN, the return value is
NaN and errno is set to EDOM.
| ANSI/ISO C | No |
| POSIX | No |