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=== Immutable variables === In [[imperative programming]], values held in [[program variable]]s whose content never changes are known as ''[[Constant (programming)|constants]]'' to differentiate them from variables that could be altered during execution. Examples include conversion factors from meters to feet, or the value of [[pi]] to several decimal places. Read-only fields may be calculated when the program runs (unlike constants, which are known beforehand), but never change after they are initialized.
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