Use fabs() (in math.h) to get absolute-value for double:
double d1 = fabs(-3.8951);
Linux Man Pages
man7.org › linux › man-pages › man3 › abs.3.html
abs(3) - Linux manual page
These functions compute the absolute value of the argument j of the appropriate integer type for the function.
TutorialsPoint
tutorialspoint.com › c_standard_library › c_function_abs.htm
C library - abs() function
#include<stdio.h> #include<stdlib.h> int main(){ int x = -2, res; printf("Original value of X is %d\n", x); // use the abs() function to get the absolute value res = abs(x); printf("Absolute value of X is %d", res); } ... Let's create another ...
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Linux Man Pages
linux.die.net › man › 3 › abs
abs(3): compute absolute value of integer - Linux man page
Returns the absolute value of the integer argument, of the appropriate integer type for the function. SVr4, POSIX.1-2001, 4.3BSD, C99.
Wikipedia
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Absorbing Man - Wikipedia
2 weeks ago - Carl "Crusher" Creel was a boxer and jailed criminal who becomes the Absorbing Man when he drinks a liquid which the Asgardian god Loki laced with a mystical potion. Discovering that he could absorb the properties of anything he touched, Creel ...
Scaler
scaler.com › home › topics › abs() function in c
abs() Function in C - Scaler Topics
March 21, 2024 - Whatever integer value we pass into the absolute function abs(), the absolute value of that integer is the return value of abs() in C.
Cppreference
en.cppreference.com › w › cpp › numeric › math › abs
std::abs, std::labs, std::llabs, std::imaxabs - cppreference.com
March 14, 2025 - #include <climits> #include <cstdlib> #include <iostream> int main() { std::cout << std::showpos << "abs(+3) = " << std::abs(3) << '\n' << "abs(-3) = " << std::abs(-3) << '\n'; // std::cout << std::abs(INT_MIN); // undefined behavior on 2's complement systems }
Top answer 1 of 7
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The standard says about abs():
The
abs,labs, andllabsfunctions compute the absolute value of an integerj. If the result cannot be represented, the behavior is undefined.
And the result indeed cannot be represented because the 2's complement representation of signed integers isn't symmetric. Think about it... If you have 32 bits in an int, that gives you 232 distinct values from INT_MIN to INT_MAX. That's an even number of values. So, if there's only one 0, the number of values greater than 0 cannot be the same as the number of values less than 0. And so there's no positive counterpart to INT_MIN with a value of -INT_MIN.
So, what's unacceptable is calling abs(INT_MIN) on your platform.
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Negative numbers are usually represented whit binary complement.
To convert positive to negative it is used logic
x -> not(x)+1
For 8 bits arithmetic
01111111b is 127 and -127 becomes
10000000b + 1 = 10000001b
and to opposite direction -127
10000001b becomes
01111110b + 1 = 01111111b
What about -128?
-128 is 10000000b and there is no positive counterpart of it, because there is no 128 in 8 bits signed arithmetic.
10000000 -> 01111111 + 1 = 10000000 and -128 again
Same applies to original question
W3Schools
w3schools.com › c › ref_stdlib_abs.php
C stdlib abs() Function
C Examples C Real-Life Examples C Exercises C Quiz C Code Challenges C Compiler C Syllabus C Study Plan C Interview Q&A C Certificate ... The abs() function returns the absolute (positive) value of a number.
Apple Developer
developer.apple.com › library › archive › documentation › System › Conceptual › ManPages_iPhoneOS › man3 › abs.3.html
Mac OS X Manual Page For abs(3)
This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles · For more information ...
GNU
gnu.org › s › libc › manual › html_node › Absolute-Value.html
Absolute Value (The GNU C Library)
Preliminary: | MT-Safe | AS-Safe | AC-Safe | See POSIX Safety Concepts. This function returns the absolute value of the floating-point number number.
C For Dummies
c-for-dummies.com › blog
The abs() Function | C For Dummies Blog
November 12, 2016 - For example, you subtract variable b from a, which returns the difference. The result could be positive or negative. To ensure that its positive, you use the abs() function:
SysTutorials
systutorials.com › docs › linux › man › 3p-abs
abs: return an integer absolute value - Linux Manuals (3p)
The abs() function shall compute the absolute value of its integer operand, i. If the result cannot be represented, the behavior is undefined. RETURN VALUE The abs()
Cplusplus
cplusplus.com › reference › cstdlib › abs
abs
The absolute value of n. In C, only the int version exists. For the long int equivalent see labs.
Men's Health
menshealth.com › fitness › abs for 2026 › 20 ab exercises that will help you carve a stronger core
Need a New Core Routine? These Are the Best Abs Exercises to Strengthen Your Six-Pack.
October 16, 2025 - These 20 ab exercises and workouts will strengthen your core, whether your ultimate goal is building a six-pack or just getting stronger.
Adobe Stock
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Abs Men Front Images – Browse 7,822 Stock Photos, Vectors, and Video | Adobe Stock
August 31, 2025 - Search from thousands of royalty-free Abs Men Front stock images and video for your next project. Download royalty-free stock photos, vectors, HD footage and more on Adobe Stock.
Muscle & Strength
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Abs Exercises: 150+ Free Video Exercise Guides | Muscle & Strength
Live Chat · 1-800-537-9910 · Ab exercises. Build impressive "6-pack abs" with these movements. View Exercise · View Exercise · View Exercise · Trending · What's New · Discussed · Name · Type Strength · Equipment Bodyweight · Mechanics Isolation · Exp. Level Beginner ·
Pinterest
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Guy Abs
Abs Pics Man · Aesthetic Abs · V Line Men Muscle · V Line Abs · Abs On Males · Bicep Pose · Muscular Boys · Ideal Physique Men · Strong Men Reference · Broad Chest Men · Buff Man Aesthetic · Men Bodies · Buff Guy Aesthetic · Muscled Men · Bicep Pose ·
Fandom
marvel-contestofchampions.fandom.com › wiki › Absorbing_Man
Absorbing Man | Marvel Contest of Champions Wiki | Fandom
January 9, 2026 - Absorbing Man is a powerful brawler with the ability to transform himself into other substances, allowing him to turn his opponents’ strengths against them and hit them where they’re weakest.
Caliber Fitness
caliberstrong.com › home › blog › a guide to the best ab exercises for men
A Guide To The Best Ab Exercises For Men
August 26, 2021 - Here is a sample ab routine that you could follow: ... 3 sets of regular or hanging leg raises, for 10-12 reps (put a dumbbell between your feet to increase the resistance) 3 sets of the ab wheel, for as many reps as you can do