wat is the use of const

Answer 1

with the const keyword you can make a variable(,parameters etc...) value not changeble. this helps prevent accidental value changes and makes the code more self-explanatory.

Answer 2

To ensure that the values of important data cannot be changed by the code.

Answer 3

for example you can define PI = 3.1415 and use it thorough your program.

Answer 4

to prevent any change for the variable; further the use of const provides the compiler to do better optimations (e.g. replace with literals)