A little History of the C language
A little dive into the history of C would be a good place to start I presume. Dennis Ritchie is the name behind this magnificent language. The C programming language had it predecessor from B created by Ken Thompson. 'C' is more of an upgrade of B. It was founded in 1978 by both Brian Kerninghan and Dennis Ritchie. C is the programming language that was used to write UNIX developed by both Dennis Ritchie and Ken Thompson. Dennis Ritchie died in October 2011 having received many awards based on his inventions and creations. Dennis Ritchie.
A journey of a thousand miles is started by taking the first step- Chinese Proverb.
Too much of that already, but we can't begin before we know what type of language C is. C is a compiled language. This means that it's not possible to write a C program and run it straight away after saving it. You have to pass it through a compiler so that it can be executed by the machine. As you already know, C being a high-level programming language it is written in a language near human language that the machine, in this case, your computer can not understand. Thus, the written program must be converted to a language that the computer understands. That is where the compiler comes in. The source code passes through four main stages before it can be executed. That's a lot of stages I know. Am I the one who is going to do all that? Relax, the compiler does all the work for you. The stages are preprocesser, compiling, assembling and the linking.
The preprocesser stage: This is the stage where the required libraries defined in the header are assembled and made available to the source code. The extension of the source code at this level is .c .Then the source code goes to the compiler stage.
The Compiling stage: The compiler compiles the source code plus all the libraries that have been assembled into another file called assembly file.
The assembly stage: At this stage we have an assembly file. The compiler assembles the required function code and makes it available for the linker to link and make an executable file out of it. The assembled data is stored in an object file with the extension .obj for windows and .o for unix users.
The linker:After all the required function code is made available, it is now time for the linker to connect all of them plus the object file to make an executable file that will now run on the computer to perform the task intended. The linker will yield an executable file with the extension .exe for windows users and a.out for unix users. This is now the binary code.
That's a lot to do isn't it? Well, that's less than blink of an eye to the computer. At this stage you know that you need a compiler if you are using a windows system but for Unix users, the gcc compiler or the gnu compiler comes already installed in the machine. All you need to do is run the
gcc command.(We'll look at it later.)
gcc file_name.c -o new_filename
Now that you know what happens to your program after you write it, it is time to get our hands dirty. Look out for my next article where we will be writing our first code and learning more about the C syntax.
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