log10(3)

💖 log10(3) — bestie edition 💖

Okay so bestie, welcome to the log10 manual page from the Library Functions Manual — she's serving base-10 logarithm realness and honestly? Iconic. Lowkey the whole family is here: log10, log10f, and log10l 💅

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✨ NAME ✨

log10, log10f, log10l — the base-10 logarithmic function, aka the way that you find out what power of ten gives you x. No cap. 🎀

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📚 LIBRARY 📚

Math library (libm, -lm) — so like, remember to link her or she will not show up. Fr fr. 🫶

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🌸 SYNOPSIS 🌸

#include <math.h>

double log10(double x);
float log10f(float x);
long double log10l(long double x);

🧚 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

Bestie, if you want log10f() and log10l() to even exist for you, you gotta unlock them with one of these ✨

log10f(), log10l():
    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

Like a vibe check but for the preprocessor. She will absolutely gatekeep you if you don't set these. 💀

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🦋 DESCRIPTION 🦋

These functions return the base-10 logarithm of x. That's it, that's the whole thing. Simple. Elegant. Main character energy. 👑

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💜 RETURN VALUE 💜

On success, these functions return the base-10 logarithm of x. Slay. ✨

But for the special cases — and yes bestie that includes where x is 0, 1, negative, infinity, or NaN — go peek at log(3). She has the tea. ☕

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😭 ERRORS 😭

Wanna know if an error even happened when you called these? Go read math_error(7), she explains how to check. 🔍

And for the whole discussion of what errors can occur for these functions, see log(3). Nothing messy happens here that isn't already log's problem, ngl.

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💅 ATTRIBUTES 💅

For an explanation of the terms used in this section, see attributes(7).

• Interface: log10(), log10f(), log10l()
  • Attribute: Thread safety
  • Value: MT-Safe

MT-Safe meaning she's safe to use across threads — no drama, no chaos, just vibes. 🌈

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🌟 STANDARDS 🌟

C11, POSIX.1-2008. Certified. Periodt. 💖

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🎀 HISTORY 🎀

C99, POSIX.1-2001.

The variant returning double also conforms to SVr4, 4.3BSD, C89. She's been around, bestie — a true legend of the game, aging like fine wine. 🍓

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👑 SEE ALSO 👑

• cbrt(3)
• clog10(3)
• exp10(3)
• log(3)
• log2(3)
• sqrt(3)

The whole logarithm friend group honestly. Go say hi. 🦋

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And that's the page, bestie!! This little masterpiece is from Linux man-pages 6.20, dated 2026-02-08, and she ate and left absolutely no crumbs 💅✨🌸💖