“Pi is a variable — it never changes.”
Usage Entry 1459 / 1605 60-second read
Variable vs. Constant
A value that can change versus a value that does not.
The comparisoni
“Pi is a constant — it never changes (3.14159...). VARIABLES change; CONSTANTS don't.”
The ruleii
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VARIABLE = changes. CONSTANT = fixed.
In math and code, a VARIABLE holds a value that may change. A CONSTANT holds a value that doesn't. Pi, e, the speed of light — physical constants. x, y, n — typical variables.
Memory aidiii
Remember it like this
Variables vary. Constants stay.