In Pascal, the
const keyword is used to declare constants. Constants are values that do not change throughout the execution of a program. The
const keyword is followed by a list of constant declarations, each consisting of a name and a value. The name is an identifier that represents the constant, and the value is the actual value of the constant.
Here is an example of declaring constants in Pascal:
PI = 3.14159;
MAX_VALUE = 100;
MESSAGE = 'Hello, World!';
In this example,
PI is a constant with the value 3.14159,
MAX_VALUE is a constant with the value 100, and
MESSAGE is a constant with the value 'Hello, World!'.
Constants can be used in expressions just like variables, but their values cannot be modified once they are declared. They provide a way to give meaningful names to values that are used repeatedly in a program, making the code more readable and maintainable.
Please let me know if you have any further questions.