std::abs, std::labs, std::llabs, std::imaxabs - cppreference.com
If std::abs is called with an unsigned integral argument that cannot be converted to int by integral promotion, the program is ill-formed. Overload (6) of std::abs for std::intmax_t is provided in …
abs, labs, llabs, imaxabs - cppreference.com
Return value The absolute value of n (i.e. |n|), if it is representable. 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, …
std::abs (float), std::fabs, std::fabsf, std::fabsl - cppreference.com
For integral arguments, the integral overloads of std::abs are likely better matches. If std::abs is called with an unsigned integral argument that cannot be converted to int by integral promotion, the …
std::abs (std::complex) - cppreference.com
Return value If no errors occur, returns the absolute value (also known as norm, modulus, or magnitude) of z. Errors and special cases are handled as if the function is implemented as std::hypot(std::real(z), …
std::abs (std::valarray) - cppreference.com
Unqualified function (abs) is used to perform the computation. If such function is not available, std::abs is used due to argument-dependent lookup. The function can be implemented with the return type …
Common mathematical functions - cppreference.com
Common mathematical functions C++
std::norm (std::complex) - cppreference.com
The Euclidean norm of a complex number is provided by std::abs, which is more costly to compute. In some situations, it may be replaced by std::norm, for example, if abs(z1) > abs(z2) then norm(z1) > …
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Numerics library - cppreference.com
The C++ numerics library includes common mathematical functions and types, as well as optimized numeric arrays and support for random number generation.
Standard library header <cstdlib> - cppreference.com
This header was originally in the C standard library as <stdlib.h>. This header provides miscellaneous utilities. Symbols defined here are used by several library components.