C++ programs contain many of the same programming statements and constructs as C programs:
A C++ name can identify any of the following:
A declaration introduces a name into a program and can define an
area of storage associated with that name.
An expression can be evaluated and is composed of operations and operands. An expression ending with a ; ( semicolon) is called a statement. A statement is the smallest independent computational unit. Functions are composed of groups of one or more statements.
A C++ program is composed of one or more functions. These
functions can all reside in a single file or can be placed in
different files that are linked to each other. In C++, a program
must have one and only one non-member function called main().
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C++ Support for Object-Oriented
Programming
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Source for a Simple C++ Program