# Numerics

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< c

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

### Common mathematical functions

The header `math.h` provides standard C library mathematical functions such as fabs, sqrt, and sin.

### Floating-point environment

The header `fenv.h` defines flags and functions related to exceptional floating-point state, such as overflow and division by zero.

### Pseudo-random number generation

The header `stdlib.h` also includes C-style random number generation via srand and rand.

### Complex number arithmetic

The header `complex.h` povides types and functions about complex numbers.

### Type-generic math

The header `tgmath.h` provides some macros for a function which names XXX:

- real function:

  - float variant `XXXf`
  - double variant `XXX`
  - long double variant `XXXl`

- complex function:

  - float variant `cXXXf`
  - double variant `cXXX`
  - long double variant `cXXXl`

### See also

C++ documentation for Numerics library

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