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    copied!<p>It usually takes up one byte (8 bits). The usual code I use to make sure type sizes are what I think they are follows. The sample output in the comment says my char is 1 byte (8 bits), and the same for bool.</p> <pre class="lang-cpp prettyprint-override"><code>/** * using gcc, you can compile this with the following command: * g++ -otype-sizes type_sizes.cpp * and then run with with * ./type-sizes * * output on my 64bit linux machine follows. Note that * the not-so-primitive types are reporting size on * the stack (the actual data in on the heap and is * not reported by sizeof()). To get the "length" of * these you can use vector&lt;&gt;::size() or string::length(). bits in a single char: 8 Sizes of primitive types: char: 1 bool: 1 short: 2 int: 4 long: 8 long long: 8 float: 4 double: 8 long double: 16 Not so primitive types: string(""): 8 string("Hello, World!"): 8 vector&lt;int&gt;(0): 24 vector&lt;int&gt;(10): 24 * **/ #include &lt;climits&gt; #include &lt;iostream&gt; #include &lt;string&gt; #include &lt;vector&gt; using namespace std; int main() { cout &lt;&lt; "bits in a single char: " &lt;&lt; CHAR_BIT &lt;&lt; endl &lt;&lt; endl &lt;&lt; "Sizes of primitive types:\n" &lt;&lt; " char: " &lt;&lt; sizeof(char) &lt;&lt; endl &lt;&lt; " bool: " &lt;&lt; sizeof(bool) &lt;&lt; endl &lt;&lt; " short: " &lt;&lt; sizeof(short) &lt;&lt; endl &lt;&lt; " int: " &lt;&lt; sizeof(int) &lt;&lt; endl &lt;&lt; " long: " &lt;&lt; sizeof(long) &lt;&lt; endl &lt;&lt; " long long: " &lt;&lt; sizeof(long long) &lt;&lt; endl &lt;&lt; " float: " &lt;&lt; sizeof(float) &lt;&lt; endl &lt;&lt; " double: " &lt;&lt; sizeof(double) &lt;&lt; endl &lt;&lt; " long double: " &lt;&lt; sizeof(long double) &lt;&lt; endl &lt;&lt; endl &lt;&lt; " Not so primitive types:\n" &lt;&lt; " string(\"\"): " &lt;&lt; sizeof(string("")) &lt;&lt; endl &lt;&lt; " string(\"Hello, World!\"): " &lt;&lt; sizeof(string("Hello, World!")) &lt;&lt; endl &lt;&lt; " vector&lt;int&gt;(0): " &lt;&lt; sizeof(vector&lt;int&gt;(0)) &lt;&lt; endl &lt;&lt; " vector&lt;int&gt;(10): " &lt;&lt; sizeof(vector&lt;int&gt;(10)) &lt;&lt; endl &lt;&lt; endl; } </code></pre>
 

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