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`gawk`

This chapter introduces some basic concepts relating to
how computers do arithmetic and defines some important terms.
It then proceeds to describe floating-point arithmetic,
which is what `awk`

uses for all its computations, including a
discussion of arbitrary-precision floating-point arithmetic, which is
a feature available only in `gawk`

. It continues on to present
arbitrary-precision integers, and concludes with a description of some
points where `gawk`

and the POSIX standard are not quite in
agreement.

NOTE:Most users of`gawk`

can safely skip this chapter. But if you want to do scientific calculations with`gawk`

, this is the place to be.

• Computer Arithmetic: | A quick intro to computer math. | |

• Math Definitions: | Defining terms used. | |

• MPFR features: | The MPFR features in `gawk` .
| |

• FP Math Caution: | Things to know. | |

• Arbitrary Precision Integers: | Arbitrary Precision Integer Arithmetic with
`gawk` .
| |

• Checking for MPFR: | How to check if MPFR is available. | |

• POSIX Floating Point Problems: | Standards Versus Existing Practice. | |

• Floating point summary: | Summary of floating point discussion. |