Creating and Running C Program

Generally, the programs created using programming languages like C, C++, Java, etc., are written using a high-level language like English. But, the computer cannot understand the high-level language. It can understand only low-level language. So, the program written in the high-level language needs to be converted into the low-level language to make it understandable for the computer. This conversion is performed using either Interpreter or Compiler.
 A compiler is a program that converts high-level language instructions into low-level language instructions. Generally, the compiler performs two things, first it verifies the program errors, if errors are found, it returns a list of errors otherwise it converts the complete code into the low-level language.

To create and execute C programs in the Windows Operating System, we need to install Turbo C software. We use the following steps to create and execute C programs in Windows OS…

Step 1: Creating a Source Code

Source code is a file with C programming instructions in a high-level language. To create source code, we use any text editor to write the program instructions. The instructions written in the source code must follow the C programming language rules. The following steps are used to create a source code file in Windows OS…

• Click on the Start button
• Select Run
• Type cmd and press Enter
• Type cd c:\TC\bin in the command prompt and press Enter
• Type TC press Enter
• Click on File -> New in C Editor window
• Type the program
• Save it as FileName.c (Use shortcut key F2 to save)

Step 2: Compile Source Code (Alt + F9)

The compilation is the process of converting high-level language instructions into low-level language instructions. We use the shortcut key Alt + F9 to compile a C program in Turbo C.

The compilation is the process of converting high-level language instructions into low-level language instructions.

Whenever we press Alt + F9, the source file is going to be submitted to the Compiler. On receiving a source file, the compiler first checks for the Errors. If there are any Errors then compiler returns List of Errors, if there are no errors then the source code is converted into object code and stores it as a file with .obj extension. Then the object code is given to the Linker. The Linker combines both the object code and specified header file code and generates an Executable file with a .exe extension.

Step 3: Executing / Running Executable File (Ctrl + F9)

After completing compilation successfully, an executable file is created with a .exe extension. The processor can understand this .exe file content so that it can perform the task specified in the source file.

We use a shortcut key Ctrl + F9 to run a C program. Whenever we press Ctrl + F9, the .exe file is submitted to the CPU. On receiving .exe file, CPU performs the task according to the instruction written in the file. The result generated from the execution is placed in a window called User Screen.

Step 4: Check Result (Alt + F5)

After running the program, the result is placed into User Screen. Just we need to open the User Screen to check the result of the program execution. We use the shortcut key Alt + F5 to open the User Screen and check the result.

Execution Process of a C Program