cexp2(3)

💖 cexp2 — bestie edition 💖

okay so real talk: this page is cexp2 from the cexp2(3) corner of the manual, and it brings its two besties cexp2f and cexp2l along for the ride. it's all about the base-2 exponent of a complex number. yes, complex numbers. yes, base 2. yes, we're thriving. ✨

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📚 LIBRARY

Math library, a.k.a. libm, and you link it like this: -lm 💅

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✨ SYNOPSIS ✨

first, the drama: you gotta pull in the complex header.

#include <complex.h>

then these three gorgeous signatures walk in:

double complex cexp2(double complex z);
float complex cexp2f(float complex z);
long double complex cexp2l(long double complex z);

three versions, three precisions, one vibe. 🦋

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🌸 DESCRIPTION 🌸

okay so here's the whole thing, and I mean the whole thing: the function returns 2 raised to the power of z. that's it. that's the function. 2^z, but make it complex. 😌

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👑 STANDARDS 👑

ngl, this is the part where it gets a little tragic. 💀

• these function names are reserved for future use in C99.
• as at glibc 2.31, these functions are not provided in glibc.

so like… the name exists, the reservations exist, the functions themselves? not beating the allegations of not existing. 🙈 it's giving "coming soon" energy since forever. if you go looking for them in glibc, bestie, they are simply not there. don't @ me, @ the standard. 😭

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🎀 SEE ALSO 🎀

the group chat, if you will:

• cabs(3)
• cexp(3)
• clog10(3)
• complex(7)

go read those, they're iconic for real. 🫶💜

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that's the whole page, no cap. shoutout to Linux man-pages 6.20, dated 2026-02-08 — the source and the date of this little masterpiece. slay, periodt. 💅✨🎀🦋🌸