IEEE_TEST(3)

✨ IEEE_TEST(3) ✨

okay so this is a page from the Library Functions Manual and it's literally called IEEE_TEST — yes bestie, the whole manual, and it lives in section 3 💅

---

🎀 NAME 🎀

scalb, scalbf, significand, significandf — the IEEE test functions 🌸

---

📚 LIBRARY 📚

Math Library (libm, -lm) — so you're gonna want that -lm on your link line, no cap 🫶

---

🦋 SYNOPSIS 🦋

#include <math.h>

double
scalb(double x, double n);

float
scalbf(float x, float n);

double
significand(double x);

float
significandf(float x);

---

💖 DESCRIPTION 💖

okay so these functions exist for exactly one reason: they let you test conformance to IEEE Std 754-1985. that's it. that's the whole gig. the manual is very clear that "their use is not otherwise recommended" — like, it's giving diagnostic tool only, not main character energy 🙈

scalb(x, n) and scalbf(x, n) return x∗(2n), and the way they do it is by pure **exponent manipulation. so cute, so efficient ✨

⚠️ but listen — if n is not an integer, or if it's ±∞, or if it's a NaN, then the result is unspecified. not undefined-in-a-fun-way, unspecified-in-a-please-don't-do-this-way. you've been warned, bestie 💀

significand(x) and significandf(x) return sig, where:

x := sig ∗ 2**n

and sig sits in the range 1 ≤ sig < 2. adorable. very normalized. very slay 👑

🚨 BUT — significand(x) and significandf(x) are not defined when x is 0, ±∞, or NaN. like, don't. just don't. 😭

---

🔥 SEE ALSO 🔥

• ieee(3)
• math(3)

the girlies to check out next, fr fr 🧚

---

⭐ STANDARDS ⭐

IEEE Std 754-1985 — the blueprint, the origin story, the moment 👑

---

that's the whole page, bestie!! this one came from Debian and it's dated November 6, 2005 — vintage, honestly 🎀 go test your IEEE conformance and stay hydrated 💜✨