7.1.2 Structure of C Program

 C Program Structure

Your First C Program

/* Header file declaration */

#include<stdio.h>

/* Main function declaration */

int main()

{

/* Printing message to screen */

printf("Hello GEC , PATAN!");

/* returning */

return 0;

}

Hello GEC , PATAN!

• The <stdio.h> header file in the first line is included in the program. This is a standard input / output header file which handles input and output in the program.
• Preprocessor directives are used to include them in the program. 
• After this the main () function has been started. 
• The execution of the program starts with the main function itself.
• All the instructions are written in the same function. 
• The main function is shown by the start and end curly brackets. 
• All the instructions inside these curly brackets are executed.
• The main function has been define with int type. This is a standard. 
• The main function is to always return an integer value. If you do not return a value return from the main () function in the program, then at the end of the program, we write return 0 statement.
• In the main function, you can also pass arguments that are called command line arguments. 
• For more information about these, read C Language Command Line Arguments in My Coding Blocks Tutorial.