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What does static variable mean?

there are 3 main uses for the static.
 1. If you declare within a function:
 It retains the value between function calls
 2.If it is declared for a function name:
 By default function is extern..so it will be visible from other files if the
 function declaration is as static..it is invisible for the outer files
 3. Static for global variables:
 By default we can use the global variables from outside files If it is
 static global..that variable is limited to with in the file