Differentiate between an external variable definition and external variable declaration  S.No   External Variable DefinitionExternal Variable Declaration1It creates variablesIt refers to the variable already defined2It allocates memoryIt does not allocates memory3The keyword extern is not usedThe keyword extern is used4It can be initializedIt can not be initialized5It appears only onceIt can be declared in many places6It must be outside all the blocks        It can appear wherever a declaration is            allowed

 

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