updated cpp/functions.md

content/cpp/functions.md

@@ -72,5 +72,37 @@ Rules for modifying function signatures:
 5. Introducing default arguments
     - __Does not change signature_
 6. Modifying return types
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+## Static Variables
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+Appending the static type to a variable declares to the compiler to only initialize the variable once. Usually, every time the function is called, the local variable gets created. The static keyword stops this behavior.
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