C Basic Program Structure

It is always useful to know about the different parts of the C program. It will be helpful for understanding the programs in upcoming chapters. Let us learn about the basic program structure of the C language.

Basic Program Structure of C Language

Any C program mostly consists of the following parts:

• Preprocessor Statements
• Functions
• Variables
• Statements & Expressions
• Comments

We will create a simple C program with minimum code & then explain each code block.

#include<stdio.h> 

int main()
{
   /* simple c program output */
   printf("Hello World! ");
   return 0;
}

Description of the sections in the above C program

#include <stdio.h>	This is a preprocessor statement that includes standard input output header file (stdio.h) from the C library. By including header file, you can use many different functions such as printf()
void main()	The execution of the C program starts with main() function. “void” is the return type of the function. Every C program can have only one main function.
Braces {}	Two curly brackets {} are used to group all code statements. This indicates begins & ends of the main function.
/* Comments */	Comments are just used to document or explain the code, to help others understand it. Everything written inside the command /*  */ will be ignored by the compiler.
printf()	printf() is a function in C, which prints the text output on the screen.
getch()	This is used to read any character input from the keyboard.

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