C++ Data Types, Variables and Expressions: Points to Remember

Points to Remember:

Every programming language has two fundamental elements, viz., data types and variables.

In C++, the data types are classified as three main categories (1) Built-in data types (2) User-defined data types (3) Derived data types.

The variables are the named space to hold values of certain data type.

There are five fundamental data types in C++: char, int, float, double and void.

C++ compiler allocates specific memory space for each and every data handled according to the compiler’s standards.

Variables are user-defined names assigned to a memory location in which the values are stored.

Declaration is a process to instruct the compiler to allocate memory as per the type specified along with the variable name.

Manipulators are used to format output of any C++ program. Manipulators are functions specifically designed to use with the insertion (<<) and extraction(>>) operators.

An expression is a combination of operators, constants and variables arranged as per the rules of C++.

The process of converting one fundamental type into another is called as “Type Conversion”. C++ provides two types of conversions (1) Implicit type conversion and (2) Explicit type conversion.