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<!DOCTYPE html>
<html dir="ltr" lang="en">
<head>
<meta charset='utf-8'>
<title>Datatypes</title>
</head>
<body>
<a href="index.html">C index</a>
<h1>Datatypes</h1>
<h2 id="types">Types</h2>
<dl>
<dt>char</dt>
<dd>Integer is 1 byte.</dd>
<dt>int</dt>
<dd>Integer numbers 4 bytes (short is 2 bytes and long is 4 bytes)</dd>
<dt>float</dt>
<dd>Single precision floating point is 4 bytes.</dd>
<dt>double</dt>
<dd>Double precision floating point is 8 bytes.</dd>
<dt>void</dt>
<dd>Absence of type.</dd>
</dl>
<h2 id="datatypes">Data types</h2>
<h2 id="int">Integer</h2>
<p>Allowed <a href="elements.html#types">types</a> are char and int;</p>
<dl>
<dt>signed char</dt>
<dd>8 bit, from -128 to 127.</dd>
<dt>unsigned char</dt>
<dd>8 bit, from 0 to 255.</dd>
<dt>char</dt>
<dd>8 bit, used to store ASCII, ex; 'h', '\n', etc...</dd>
<dt>short int</dt>
<dd>16 bit, from -32,768 to 32,767.</dd>
<dt>unsigned short int</dt>
<dd>16 bit, from 0 to 65,535.</dd>
<dt>int</dt>
<dd>32 bit, from -2,147,483,648 to 2,147,483,647.</dd>
<dt>unsigned int</dt>
<dd>32 bit, from 0 to 4,294,967,295.</dd>
<dt>long int</dt>
<dd>32 bit, from -2,147,483,648 to 2,147,483,647.</dd>
<dt>unsigned long int</dt>
<dd>32 bit, from 0 to 4,294,967,295.</dd>
<dt>long long int</dt>
<dd>64 bit, from 9,223,372,036,854,775,808
to 9,223,372,036,854,775,807.</dd>
<dt>unsigned long long int</dt>
<dd>64 bit, from 0 to 18,446,744,073,709,551,615.</dd>
</dl>
<h2 id="double">Real number</h2>
<p>Real numbers are fractional numbers, all floating points
are signed. Check float.h.</p>
<dl>
<dt>float</dt>
<dd>From 1e-37 to 1e37</dd>
<dt>double</dt>
<dd>Largest of floating point.</dd>
<dt>long double</dt>
<dd>The long double data maybe larger than double</dd>
</dl>
<h2 id="complex">Complex number</h2>
<p><a href="https://www.gnu.org/software/gnu-c-manual/gnu-c-manual.html#Standard-Complex-Number-Types">Complex Number Types</a></p>
<h2 id="enum">Enumeration</h2>
<pre>
enum colors {black, orange, blue} color;
enum colors color;
</pre>
<h2 id="union">Unions</h2>
<pre>
union accounts {
int id;
float value;
} first_account, second_account;
</pre>
<h2 id="struct">Structures</h2>
<pre>
struct point {
int x, y, z;
} first_point;
struct point second_point;
</pre>
<h2 id="array">Arrays</h2>
<pre>
int account_array[9];
int account_array[] = {0, 1, 2, 3};
int account_array[] = {0, 1, 2, [9] = 9};
</pre>
<pre>
int account_array[2][9] { {1,2,3},{9,8,7} }
</pre>
<p>Initializing string with individual characters the
null character must be defined;</p>
<pre>
char black[] = {'b', 'l', 'a', 'c', 'k', '\0'}
</pre>
<pre>
char black[] = "black";
</pre>
<pre>
union accounts {
int id;
float value;
};
union accounts accounts_array[9];
accounts_array[0].id = 8;
</pre>
<pre>
struct point {
int x, y;
};
struct point point_array[9];
point_array[0].x=2;
point_array[0].y=3;
</pre>
<h2 id="pointer">Pointers</h2>
<h2 id="it">Incomplete types</h2>
<h2 id="tq">Type qualifiers</h2>
<h2 id="st">Storage class</h2>
<h2 id="format">Format Type Specifiers</h2>
<dl>
<dt>%c</dt>
<dd>Character</dd>
<dt>%s</dt>
<dd>String of characters</dd>
<dt>%d</dt>
<dd>Decimal integer</dd>
<dt>%f</dt>
<dd>Decimal floating point</dd>
<dt>%llu</dt>
<dd>unsigned long long</dd>
<dt>%o</dt>
<dd>Signed octal</dd>
<dt>%u</dt>
<dd>Unsigned decimal integer</dd>
<dt>%x</dt>
<dd>Unsigned hexadecimal integer</dd>
<dt>%p</dt>
<dd>Pointer address</dd>
</dl>
<a href="index.html">C Index</a>
<p>This is part of the LeetIO System Documentation.
Copyright (C) 2021
LeetIO Team.
See the file <a href="../../fdl-1.3-standalone.html">Gnu Free Documentation License</a>
for copying conditions.</p>
</body>
</html>
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