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For questions about variables, named storage locations that hold a value, which can be changed during the execution of a program.
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Why do some languages have both immutable "variables" and constants?
Unlike constants, the storage for variables can also be allocated and deallocated dynamically - that is, variables can be allocated in main memory, but have no equivalent space already reserved in the … The essential difference between constants and immutable variables, is that constants have their values built at compile-time, whereas immutable variables have their values built at run time. …