Getting Started
Basic Structure of C Program
First step is to understand the structure of a “ C “ programming language using simple C program.Let us look a simple code that would print the word “Learn C :) ”.
#include <stdio.h>
int main()
{
/* My First program in C :) */
printf("Learn C :)");
return 0;
}
Output
Learn C :)| S.no | Coding | Explanation |
| 1 | #include <stdio.h> | This is a preprocessor command it tells the C compiler to include “stdio.h” from the C library before compiling a C program. |
| 2 | int main() | This is the main function from where execution of any C program begins. |
| 3 | { | This indicates the beginning of the main function. |
| 4 | /*_some_comments_*/ or // some_comments |
The comments are ignored by compiler. [ “ /*..*/ ”,” //... “ ] |
| 5 | printf("Learn C :)"); | printf command prints the output onto the screen. |
| 6 | return 0; | This command terminates C program (main function) and returns 0 value to the main function. |
| 7 | } | This indicates the end of the main function. |
Semicolon ( ; )
In C program, the semicolon is a statement terminator. In each individual statement must be ended with a semicolon.Comma operator ( , )
The coma operator is used to separates the elements of variables in data type or element in array etc.Ex: int a=7,b,c;
Whitespace ( )
Whitespace is the term used in C to describe blanks space like tabs, horizontal tab, newline characters(pressing Enter key and write coding in new line ) and space between comments. Whitespace separates one part of a statement from another and enables the compiler to identify elements in a statement.Ex: int i, void main(), etc..,.
The following two example program will help you to learn more about whitespace.
Example: 1:-More Whitespace
#include <stdio.h>
int main()
{
printf
(
" Learn C :) "
)
;
return 0;
}
Remember at least one whitespace character (space) between int main(), int i;, return 0;, etc..,
Example: 2:-
#include <stdio.h>
int main(){printf(" Learn C :) ");return 0;} 
