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The GNU C Library

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20. Arithmetic Functions

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'.

20.1 Integers    Basic integer types and concepts

20.2 Integer Division    Integer division with guaranteed rounding.

20.3 Floating Point Numbers    Basic concepts. IEEE 754.

20.4 Floating-Point Number Classification Functions    The five kinds of floating-point number.

20.5 Errors in Floating-Point Calculations    When something goes wrong in a calculation.

20.6 Rounding Modes    Controlling how results are rounded.

20.7 Floating-Point Control Functions    Saving and restoring the FPU's state.

20.8 Arithmetic Functions    Fundamental operations provided by the library.

20.9 Complex Numbers    The types. Writing complex constants.

20.10 Projections, Conjugates, and Decomposing of Complex Numbers    Projection, conjugation, decomposition.

20.11 Parsing of Numbers    Converting strings to numbers.

20.12 Old-fashioned System V number-to-string functions    An archaic way to convert numbers to strings.

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20.1 Integers		Basic integer types and concepts
20.2 Integer Division		Integer division with guaranteed rounding.
20.3 Floating Point Numbers		Basic concepts. IEEE 754.
20.4 Floating-Point Number Classification Functions		The five kinds of floating-point number.
20.5 Errors in Floating-Point Calculations		When something goes wrong in a calculation.
20.6 Rounding Modes		Controlling how results are rounded.
20.7 Floating-Point Control Functions		Saving and restoring the FPU's state.
20.8 Arithmetic Functions		Fundamental operations provided by the library.
20.9 Complex Numbers		The types. Writing complex constants.
20.10 Projections, Conjugates, and Decomposing of Complex Numbers		Projection, conjugation, decomposition.
20.11 Parsing of Numbers		Converting strings to numbers.
20.12 Old-fashioned System V number-to-string functions		An archaic way to convert numbers to strings.