Preparation of C Program for Execution

Dear readers,

              In this lesson we tell you about the some necessary steps to prepare C program for execution..

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• Some steps which are taken to prepare a C program for execution are :-

1. Creating & Editing C Program
2. saving C program
3. Compiling C program
4. Linking C program
5. Loading C program
6. Executing C program

• Creating & Executing C program :-

                                                   The first step is to create and edit the source program in C. The C program is usually and edited in Turbo C editor.

• Saving C program :-

After writing or editing the source program, it is saved on the disk as text file with an extension ".c".

• Compiling C program :-

In this step, the source program is compiled. The source program is converted into machine code. The C compiler is used to translate  the C program source code into the machine code.

• Linking C program :-

In this step, the Linker links object file produced by the compiler to many other library files.

 After linking the object code  to the libraries, an executable file with extension EXE is created.

• Loading C program :-

                    In this step the loader loads the executable file from disk into memory for execution. The program must be loaded into memory for execution.

• Executing C program :-

In this step, the program is executed on the computer. The CPU fetches instructions of program from memory one by one and takes action on them.

Creating, Editing and Saving C program

Dear Readers,

       In this lesson following topics are covered...

• Creating C Program
• Editing C Program
• Saving C Program

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               You can write, edit and save a C program in any text editor program. But Turbo C provides a complete IDE for this purpose. You can easily write, edit and save C program in TC editor.

• Creating C Program :-

                  The process of writing a new C program by following the rules of C language is called creating a C program. To write a new C program, load the TC editor and type the source code of program.

• Editing C Program :-

   

                    You can also make changes during writing new programs as well as in the exiting C program. Therefore, the process of writing, changing and revising the source code is called editing program.

• Saving C Program :-

 

                        After writing or editing the source program, you should save it on the disk as text file with an extension " .c ". This process is called saving the program.

                         To save source code in TC editor, follow these steps.

• Select Save command from file menu or press F2 key. A dialog box will appear. The default file name of source code is NONAME00.C
•     Type the name of file such as "first.c" and press Enter key. You can also select a specific folder (or location). where you want to save the file. Turbo C editor automatically assigns the file extension as " .c "

Note:-

                                            You can also compiler and run C program in Turbo C IDE without saving it first but it is not a good practice. You must save the program before compiling and executing it. It is because sometimes your program may be hanged during execution and your source program code may be erased from the main memory.