An internal static variable retains its value from one call to another.  

An external static variable is only visible within the file in which it's
declared.  

See page 83 of Kernighan and Ritchie, second edition.

> Is "static" redundant in the following block of code?
>(3)
>static int an_int=3;
>int a_sub(. . .)
>{
>. . .
>}



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