Base-2 exponent of a complex number
double complex cexp2(double complex z);
float complex cexp2f(float complex z);
long double complex cexp2l(long double complex z);
Link with -lm.
The function returns 2 raised to the power of z.
These function names are reserved for future use in C99.
Not yet in glibc, as at version 2.19.
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