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If I have a C file like below, what is the difference between i and j?
#include <stdio.h> #include <stdlib.h> static int i; int j; int main () { //Some implementation } 
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Terminology. class (keyword): static functions that are dynamically dispatched and can be overridden by a subclasses. global functions: functions defined at global scope, that is they can be called from anywhere.
A global variable is one declared at the start of the code and is accessible to all parts of the program. Since Java is object-oriented, everything is part of a class. ... A static variable can be declared, which can be available to all instances of a class.
Automatic variables create a new each time when program's execution enters in the function and destroys when leaves. Static variable create once, when program's execution enters in the function first time, destroys when program's execution finishes, they do not again.
Static Variables: When a variable is declared as static, then a single copy of the variable is created and shared among all objects at a class level. Static variables are, essentially, global variables. All instances of the class share the same static variable.
i has internal linkage so you can't use the name i in other source files (strictly translation units) to refer to the same object.
j has external linkage so you can use j to refer to this object if you declare it extern in another translation unit.
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