Variables and Constants
During the running of a computer program, there will be times when the program needs to remember/store a value so it can be read and used later on.
A program can contain many variables and constants, so it is important to give them sensible names that try to describe the item of data that they hold.
- The value stored in a variable can/may change during the running of the program
- The value stored in a constant cannot be changed during the running of the program
Both constants and variables can only hold one piece of data at a time. When a new value is assigned to variable (using an assignment statement) it automatically replaces whatever was stored previously.