# Numerics library

From cppreference.com

The C++ numerics library includes common mathematical functions and types, as well as optimized numeric arrays and support for random number generation.

## Contents |

### Common mathematical functions

The header `cmath`

provides standard C library mathematical functions such as std::fabs, std::sqrt, and std::sin.

### Complex numbers

Defined in header
`<complex>` | |

a complex number type (class template) |

### Numeric arrays

Defined in header
`<valarray>` | |

numeric arrays and array slices (class template) |

### Generic numeric operations

Template:cpp/algorithm/dcl list iotaTemplate:cpp/algorithm/dcl list accumulateTemplate:cpp/algorithm/dcl list inner productTemplate:cpp/algorithm/dcl list adjacent differenceTemplate:cpp/algorithm/dcl list partial sum Defined in header
`<numeric>` |

### Pseudo-random number generation

The header `random`

defines pseudo-random number generators and numerical distributions. The header `cstdlib`

also includes C-style random number generation via std::srand and std::rand.

### Compile time rational arithmetic (since C++11)

The header `ratio`

provides types and functions for manipulating and storing compile-time ratios.

### Floating-point environment

The header `fenv`

defines flags and functions related to exceptional floating-point state, such as overflow and division by zero.