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Declaring Variables in C++

Variables in C++ are used to store data that can be manipulated by the program. To declare a variable, you specify the data type followed by the variable name.

Key Topics

Syntax of Variable Declaration

The basic syntax for declaring a variable in C++ is:

data_type variable_name;

Explanation: Replace data_type with a valid C++ data type (e.g., int, double, char) and variable_name with a valid identifier.

Examples

Example 1: Declaring an Integer Variable

int age;
age = 30;

Code Explanation: First, we declare a variable named age of type int. Then, we assign it the value 30.

Example 2: Declaring and Initializing in One Line

int age = 30;

Code Explanation: Here, we declare and initialize the variable age in a single statement.

Best Practices

  • Always initialize variables to avoid undefined behavior.
  • Use meaningful variable names for better readability.
  • Stick to a consistent naming convention (e.g., camelCase or snake_case).

Key Takeaways

  • Variables must be declared before they are used in the code.
  • You can declare and initialize variables separately or in a single line.
  • Proper variable naming enhances code clarity and maintainability.
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