.. _C++data:

Fundamental Data Types
======================

C++ supports all the fundamental data types found in C. C++ also
has the same storage classes as C.

Booleans
--------

C++ has a boolean data type which take values of either
`true` or `false`. The boolean data type is named `bool`

In C and also C++, integers are often used as a boolean value. Here
the value of zero represents the `false` and any other value is
`true`. Consider, for example, a simple string copy in C as below.
A `while` statement requires a logical (boolean) expression, yet
integer assignment is used here. The loop stops after assignment of the
null terminator (`\0`).

    ::

        while( *p++ = *q++ ) ;


Similarly, the C++ `bool` data type can be used as an integer which
takes values of either one or zero.

    ::

        bool test = true;
        int i = 2 + test;  // i is now 3.
        test = test - 1;   // test is now 0, or false.


enum
----

The :keyword:`enum` data type behaves the same as the C :keyword:`enum` data
type.