Variable in c++




C++ Variables

Variables are containers for storing data values.

In C++, there are different types of variables (defined with different keywords), for example:

  • int - stores integers (whole numbers), without decimals, such as 123 or -123
  • double - stores floating point numbers, with decimals, such as 19.99 or -19.99
  • char - stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes
  • string - stores text, such as "Hello World". String values are surrounded by double quotes
  • bool - stores values with two states: true or false

Declaring (Creating) Variables

To create a variable, specify the type and assign it a value:



Syntax

type variableName = value;

Where type is one of C++ types (such as int), and variableName is the name of the variable (such as x or myName). The equal sign is used to assign values to the variable.

To create a variable that should store a number, look at the following example:


Example

int myNum;
myNum = 15;
cout << myNum;


int myNum = 15;  // myNum is 15
myNum = 10;  // Now myNum is 10
cout << myNum;  // Outputs 10