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This chapter contains information about functions for doing basic
arithmetic operations, such as splitting a float into its integer and
fractional parts or retrieving the imaginary part of a complex value.
These functions are declared in the header files `math.h` and
`complex.h`.

• Integers: | Basic integer types and concepts | |

• Integer Division: | Integer division with guaranteed rounding. | |

• Floating Point Numbers: | Basic concepts. IEEE 754. | |

• Floating Point Classes: | The five kinds of floating-point number. | |

• Floating Point Errors: | When something goes wrong in a calculation. | |

• Rounding: | Controlling how results are rounded. | |

• Control Functions: | Saving and restoring the FPU’s state. | |

• Arithmetic Functions: | Fundamental operations provided by the library. | |

• Complex Numbers: | The types. Writing complex constants. | |

• Operations on Complex: | Projection, conjugation, decomposition. | |

• Parsing of Numbers: | Converting strings to numbers. | |

• System V Number Conversion: | An archaic way to convert numbers to strings. |