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Using Constants in C++

Constants are fixed values that cannot be altered by the program during execution. In C++, you can define constants using the const keyword.

Key Topics

Defining Constants

const data_type constant_name = value;

Explanation: Prefix the variable declaration with const to make it a constant.

Examples

Example: Defining a Constant

const double PI = 3.14159;
const int BIRTH_YEAR = 1995;
const char GRADE = 'A';

Code Explanation: Constants PI, BIRTH_YEAR, and GRADE are defined with fixed values that cannot be changed later in the program.

Key Takeaways:

  • Use constants for values that should remain unchanged.
  • Constants improve code maintainability and readability.
  • Attempting to modify a constant will result in a compile-time error.
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