6.1.1 Constant Literals

• Constant literals are values that you use directly in the program. 
• For example, look at the given code below.

y = x+2;

• In the above given statement 2 is a constant literal. 
• It has been directly used in the program. 
• It can not be changed during the execution of the program.
• Consider Constant literals such as direct values that can not be changed. 
• Normally the use of literal constants is not advised.
• Suppose you have used a literal constant in many places in the program, now if you need to change this constant, then you need to manually find it and change it all in the program.
• Therefore, you should minimize the use of literal constants.