Question

how variable differ from constant

Answer 1

Variable are the memory location of the data and the value of the variable can be changed but constants are the literals whose value cannot be changed in the program.
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Answer 2

The difference between variables snd constants is that variables can change their value at any time but constants can never change their value. (Theconstants value is locked for the duration of the program).Constants can be very useful, Pi for instance is a good example to declare as a constant.

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