std::abs(float), std::fabs
From cppreference.com
Defined in header <cmath>
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float abs( float arg ); |
(1) | |
double abs( double arg ); |
(2) | |
long double abs( long double arg ); |
(3) | |
double abs( Integral arg ); |
(4) | (since C++11) |
float fabs( float arg ); |
(5) | |
double fabs( double arg ); |
(6) | |
long double fabs( long double arg ); |
(7) | |
double fabs( Integral arg ); |
(8) | (since C++11) |
1-3,5-7) Computes the absolute value of a floating point value
arg
.4,8) A set of overloads or a function template for all combinations of arguments of arithmetic type not covered by (1-3,5-7). If any argument has integral type, it is cast to double. If any other argument is long double, then the return type is long double, otherwise it is double.
Contents |
[edit] Parameters
arg | - | Value of a floating-point or Integral type |
[edit] Return value
If successful, returns the absolute value of arg
(|arg|
). The value returned is exact and does not depend on any rounding modes.
[edit] Error handling
This function is not subject to any of the error conditions specified in math_errhandling
If the implementation supports IEEE floating-point arithmetic (IEC 60559),
- If the argument is ±0, +0 is returned
- If the argument is ±∞, +∞ is returned
- If the argument is NaN, NaN is returned
[edit] Notes
The overloads of std::abs
for integer types (4) disagree in return types with the integer overloads of std::abs
defined in <cstdlib>
, and they also introduce the dangerous overloads of std::abs
for unsigned integer types (Defect reports LWG 2192 and LWG 2294)
[edit] Example
Run this code
Possible output:
abs(+3.0) = 3 abs(-3.0) = 3 abs(-0.0) = 0 abs(-Inf) = inf
[edit] See also
(C++11) |
computes absolute value of an integral value (|x|) (function) |
(C++11) |
copies the sign of a floating point value (function) |
(C++11) |
checks if the given number is negative (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 fabs
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