C&c red alert 2 game running way slow in win 10

Therefore whenever we define a C function, an extern is present there in the beginning of the function definition. Same is the case with the definition of a C function (Definition of a C function means writing the body of the function). ThereвЂ™s an extern present in the beginning which is hidden and the compiler treats it as below.

It means even though we donвЂ™t use extern with the declaration/definition of C functions, it is present there.

IвЂ™ve explained the role of declaration/definition because itвЂ™s mandatory to understand them to understand the вЂњexternвЂќ keyword.Д«y default, the declaration and definition of a C function have вЂњexternвЂќ prepended with them. Now coming back to our main objective: Understading of 'extern keyword in C. Remember the basic principle that you canвЂ™t have two locations of the same variable/function. From this explanation, it should be obvious that a variable/function can be declared any number of times but it can be defined only once. (or declaration as a subset of definition). Therefore, we can think of definition as a super set of declaration. So thatвЂ™s all about declaration.Дefinition of a variable/function:-Coming to the definition, when we define a variable/function, apart from the role of declaration, it also allocates memory for that variable/function. In case of function declaration, the program knows what are the arguments to that functions, their data types, the order of arguments and the return type of the function. When a variable is declared, the program knows the data type of that variable. Though (almost) everyone knows the meaning of declaration and definition of a variable/function yet for the sake of completeness of this post, I would like to clarify them.Дeclaration of Variable/function:-Declaration of a variable/function simply declares that the variable/function exists somewhere in the program but the memory is not allocated for them.

Basically extern keyword extends the visibility of the C variables and C functions. So let me start with saying that extern keyword applies to C variables (data objects) and C functions.

C&c red alert 2 game running way slow in win 10