std::abs(int), std::labs, std::llabs, std::imaxabs
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header  <cstdlib> | ||
| Defined in header  <cmath> | (since C++17) | |
| int       abs( int n ); | ||
| long      abs( long n ); | ||
| long long abs( long long n ); | (since C++11) | |
| Defined in header  <cstdlib> | ||
| long       labs( long n ); | ||
| long long llabs( long long n ); | (since C++11) | |
| Defined in header  <cinttypes> | ||
| std::intmax_t abs( std::intmax_t n ); | (since C++11) | |
| std::intmax_t imaxabs( std::intmax_t n ); | (since C++11) | |
Computes the absolute value of an integer number. The behavior is undefined if the result cannot be represented by the return type.
| Contents | 
[edit] Parameters
| n | - | integer value | 
[edit] Return value
The absolute value of n (i.e. |n|), if it is representable.
[edit] Notes
In 2's complement systems, the absolute value of the most-negative value is out of range, e.g. for 32-bit 2's complement type int, INT_MIN is -2147483648, but the would-be result 2147483648 is greater than INT_MAX, which is 2147483647.
[edit] Example
Run this code
#include <iostream> #include <cstdlib> #include <climits> int main() { std::cout << "abs(+3) = " << std::abs(3) << '\n' << "abs(-3) = " << std::abs(-3) << '\n'; // std::cout << abs(INT_MIN)); // undefined behavior on 2's complement systems }
Output:
abs(+3) = 3 abs(-3) = 3
[edit] See also
| absolute value of a floating point value (|x|) (function) | |
| returns the magnitude of a complex number (function template) | |
| applies the function std::abs to each element of valarray (function template) | |
| C documentation for abs, labs, llabs | |


