A variable is a named object that is mutable.
A constant is a named object that is immutable.
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Variables are items, which change their values during the execution of a program.
Constants do not change the value during the execution of a program.
The constant is the number; the variable is the letter.
The question is about an oxymoronic expression. A constant cannot be a variable and a variable cannot be a constant!
Constant variable
The opposite of the word "constant" is "variable".
The constant variable.