21 Jan C++ Variables

Variable names in C++ are the names given to locations in memory. These locations can be an integer, characters, or real constants. In addition, a variable type can only hold the same constant type. In this lesson, we will learn how to work with Variables in C++.

Rules for naming a variable in C++

The following are the rules for naming a variable: The first character in a variable name must be an underscore or alphabet. Here are the rules, with some examples,

• A variable name is a combination of alphabets 1 to 31, digits, or underscores.
  
• No special symbol in a variable name is valid, except the underscore.

• No comma is allowed in a variable name.
• In addition, no blank space is valid.

Always try to create meaningful names. For example, the variable names for calculating the results of students can be given variable name results.

Variable Declaration

Declaration of a variable in C++ is quite easy. The following is the syntax showing how to declare variables in C++,

The valid variable declaration examples are shown below. Here, int, char, and float are datatypes,

The preceding examples show how a variable is declared, wherein a datatype precedes the variable name.

The following examples demonstrate the usage of variables in C++,