Lec 3 : Built in Functions in C++ | Function in C Language | C++ Tutorials for Beginners

Lec 3 : Built in Functions in C++ | Function in C Language | C++ Tutorials for Beginners
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🔸The compilation process is complicated but interesting in c language. If a program has multiple files then each file compiles individually and creates the object of each source file , We will discuss about this in the video.
The important role of linkers comes after the creation of object files. It performs two important task symbol resolution and relocation. The linker takes each object file and creates one absolute object file.
When the linking process starts, linkage property comes into the play. In this article, I will not discuss the linker, I will only discuss the linkage.
According to C standards, “An identifier declared in different scopes or in the same scope more than once can be made to refer to the same object or function by a process called linkage”.
External Linkage in C:
If an identifier has file scope and does not use the static storage class specifier at the time of the first declaration, the identifier has the external linkage.
Internal Linkage in C:
If a global identifier declares with static storage class, its linkage will be internal. An identifier implementing internal linkage is not accessible outside the translation unit in which it is declared.
An identifier with internal linkage denotes the same object or function within one translation unit if it is accessed by any function.
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