A variable name can be composed of letters, digits and underscore (_); a name must begin with a letter or underscore Variables are de ned by pre xing a name with a type, and can optionally be initialised; …

C++ also allows to define various other types of variables, which we will cover in subsequent chapters like Enumeration, Pointer, Array, Reference, Data structures, and Classes.

Hello Learning Outcomes Understand what a variable is, and the various data types in C++ Demonstrate the ability to declare variables of various data types

The types of variables used in C++ programs are described in Table 3.1. This table shows the variable type, how much room this book assumes it takes in memory, and what kinds of values can be stored …

Variables in C++ A variable is a name which is associated with a value that can be changed. For example when I write int num=20; here variable name is num which is associated with value 20, int is …

Variable Scope Variable Declaration vs Definition Declaration: tell the compiler about the variable/function you are going to without actually allocating space. Definition: allocating a space for …

Constants There are several different kind of constants: literals symbolic constants declared constants using const: used in variable declarations and informs the compiler that a variable is not supposed to …

Basic data types in C++ (int) Integer (int). Represent the set of integer numbers. In practice, computers have a limitation representing integer numbers.