Constant - GCSE Computer Science Definition

In GCSE Computer Science, a "constant" is a value that remains unchanged throughout the execution of a program. Unlike variables, which can be modified, constants are used to store data that should not be altered once defined. They are particularly useful for representing fixed values, such as the days in a week or mathematical constants like pi. By using constants, programs become easier to read, maintain, and less error-prone, as there is no risk of accidentally modifying a value that should remain constant throughout the program’s lifecycle. Constants are typically declared at the beginning of a program or a block of code and are often identified by using uppercase letters to distinguish them from variables.