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<title>Arithmetic - The GNU C Library</title>
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<!-- %MENU% Low level arithmetic functions -->
<h2 class="chapter">20 Arithmetic Functions</h2>

<p>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 <samp><span class="file">math.h</span></samp> and
<samp><span class="file">complex.h</span></samp>.

<ul class="menu">
<li><a accesskey="1" href="Integers.html#Integers">Integers</a>:                     Basic integer types and concepts
<li><a accesskey="2" href="Integer-Division.html#Integer-Division">Integer Division</a>:             Integer division with guaranteed rounding.
<li><a accesskey="3" href="Floating-Point-Numbers.html#Floating-Point-Numbers">Floating Point Numbers</a>:       Basic concepts.  IEEE 754.
<li><a accesskey="4" href="Floating-Point-Classes.html#Floating-Point-Classes">Floating Point Classes</a>:       The five kinds of floating-point number.
<li><a accesskey="5" href="Floating-Point-Errors.html#Floating-Point-Errors">Floating Point Errors</a>:        When something goes wrong in a calculation.
<li><a accesskey="6" href="Rounding.html#Rounding">Rounding</a>:                     Controlling how results are rounded.
<li><a accesskey="7" href="Control-Functions.html#Control-Functions">Control Functions</a>:            Saving and restoring the FPU's state.
<li><a accesskey="8" href="Arithmetic-Functions.html#Arithmetic-Functions">Arithmetic Functions</a>:         Fundamental operations provided by the library.
<li><a accesskey="9" href="Complex-Numbers.html#Complex-Numbers">Complex Numbers</a>:              The types.  Writing complex constants.
<li><a href="Operations-on-Complex.html#Operations-on-Complex">Operations on Complex</a>:        Projection, conjugation, decomposition.
<li><a href="Parsing-of-Numbers.html#Parsing-of-Numbers">Parsing of Numbers</a>:           Converting strings to numbers.
<li><a href="System-V-Number-Conversion.html#System-V-Number-Conversion">System V Number Conversion</a>:   An archaic way to convert numbers to strings.
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