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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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