Language basics : variables, constants

• Variables represent data (objects) needed in a program.

• A variable is declared by specifying its data type and identifier by which it will be referenced.

• Example : float Radius;

• Constants are data that have constant value within the context of a problem. The value of a constant remains unchanged throughout the execution of the program.

• Style: Always use symbolic constant.

• const float PI = 3.14;

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