clog2(3)

💖 clog2 — the glow-up log edition 🎀

okay so bestie, welcome to clog2(3) from the Library Functions Manual ✨ this one's cute, short, and ngl a lil mysterious. grab a boba, we're doing complex numbers 💅

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✨ NAME ✨

clog2, clog2f, clog2l — base-2 logarithm of a complex number 🦋

like. it's log. but base 2. but the input is complex. main character math fr 💜

📚 LIBRARY 📚

Math library (libm, link it with -lm) 🧚

not me forgetting -lm every single time 😭 always forget, always regret.

🌸 SYNOPSIS 🌸

#include <complex.h>

double complex clog2(double complex z);
float complex clog2f(float complex z);
long double complex clog2l(long double complex z);

three flavors, one vibe ✨ pick your precision, bestie 🎀

💫 DESCRIPTION 💫

So the call clog2(z) is equivalent to:

clog(z)/log(2)

that's literally it. that's the whole thing 👑

The other functions perform the same task for float and long double. so clog2f is the float girlie, clog2l is the long double icon, same job, different widths 💅

⚠️ ok important one, no skipping: note that z close to zero will cause an overflow. so like… don't. or do, but know what's coming 💀 it's giving chaos.

📜 STANDARDS 📜

None. 🫶 nothing. not a single one. it's a free spirit.

🕰️ HISTORY 🕰️

These function names are reserved for future use in C99. iykyk — reserved means hands off, they were putting a little placeholder sticker on them 🎀

Also: Not yet in glibc, as at glibc 2.19. so don't come for glibc, it simply wasn't there yet 🙈

👀 SEE ALSO 👀

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

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and that's the whole page, bestie 🌈 go forth and log in base 2, but like… complexly 💖

this little love letter to man pages is from Linux man-pages 6.20, dated 2026-02-08 — periodt ✨💅