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.
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,
int marks_one, marks_two;
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++,