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C - basic program and program structure
Neeraj Yadav

C - basic program and program structure

10-Jul-2016 | | Total View : 362 |

In the previous tutorial we learn about basic introduction of C language and how to setup Turboo C++ in PC. Hope you like our previous articles. If you miss those articles then please click on below link to read them first.

1 - C language Tutorials - What is C language? basic information

2 - How to install and Run C language program in PC - Support Full Screen


C - Program structure

In this part of tutorial we will learn about C - Program structure and how to write a sample code for C language. We are going to learn a simple “Hello World” C program in this section.  let us look at a bare minimum C program structure - 

Before we begin with our first C program do remember the some rules that are applicable to all C programs.

C program basically consists of the following parts:

  1. Preprocessor Commands
  2. Functions
  3. Comments
  4. Variables
  5. Statements & Expressions

To write the first c program, open the C console and write the following code:

#include <stdio.h>  

#include <conio.h>  

void main() {  

/* my first program in C */

printf("Hello GupShupStudy");   

getch();  

}   

Let us take a look at the various parts of the above program −

  • The first line of the program #include <stdio.h> is a preprocessor command, which tells a C compiler to include stdio.h file before going to actual compilation.

#include <stdio.h> includes the standard input output library functions. The printf() function is defined in stdio.h .

#include <conio.h> includes the console input output library functions. The getch() function is defined in conio.h file.

  • The next line void main() is the main function where the program execution begins.

  • The next line /* my first program in C */ will be ignored by the compiler and it has been put to add additional comments in the program. So such lines are called comments in the program.

  • The next line printf(...) is another function available in C which causes the message "Hello, World!" to be displayed on the screen.

  • getch() The getch() function asks for a single character. Until you press any key, it blocks the screen.



How to compile and Execute the C program - 

1 - To compile the program press + keys. if there are any error on program then it will be shown.

2 - To Execute (Run) the program press + keys. and the Output is -



Note: use "clrscr()" after the Main Function to clear the output screen. this will clear previous output everytime you run a program.


Without "Clrscr()"

With "Clrscr()"

 

You can view the user screen any time by pressing the + keys.


Save the Code -

To save the program press  key, or go to File and Click on Save icon.

"Don't forget to save file name with ".CPP" extension.


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