Warning: Undefined variable $user in /home/geekint/public_html/learn/wp-content/plugins/google-plus-authorship/google-plus-authorhip.php on line 28

Warning: Attempt to read property "ID" on null in /home/geekint/public_html/learn/wp-content/plugins/google-plus-authorship/google-plus-authorhip.php on line 28

Deprecated: Function get_bloginfo was called with an argument that is deprecated since version 2.2.0! The home option is deprecated for the family of bloginfo() functions. Use the url option instead. in /home/geekint/public_html/learn/wp-includes/functions.php on line 6114

Deprecated: Function get_the_author_ID is deprecated since version 2.8.0! Use get_the_author_meta('ID') instead. in /home/geekint/public_html/learn/wp-includes/functions.php on line 6114

Warning: Undefined variable $customprofilefield in /home/geekint/public_html/learn/wp-content/plugins/author-box-with-different-description/author_box_display.php on line 66

Deprecated: Function get_the_author_description is deprecated since version 2.8.0! Use get_the_author_meta('description') instead. in /home/geekint/public_html/learn/wp-includes/functions.php on line 6114

Warning: Undefined variable $display_author_email in /home/geekint/public_html/learn/wp-content/plugins/author-box-with-different-description/author_box_display.php on line 152

Warning: Undefined variable $display_google_profile in /home/geekint/public_html/learn/wp-content/plugins/author-box-with-different-description/author_box_display.php on line 152

Warning: Undefined variable $display_facebook_profile in /home/geekint/public_html/learn/wp-content/plugins/author-box-with-different-description/author_box_display.php on line 152

Warning: Undefined variable $display_twitter_profile in /home/geekint/public_html/learn/wp-content/plugins/author-box-with-different-description/author_box_display.php on line 152

Warning: Undefined variable $display_youtube_profile in /home/geekint/public_html/learn/wp-content/plugins/author-box-with-different-description/author_box_display.php on line 152

Warning: Undefined variable $display_linkedin_profile in /home/geekint/public_html/learn/wp-content/plugins/author-box-with-different-description/author_box_display.php on line 152

Warning: Undefined variable $display_pinterest_profile in /home/geekint/public_html/learn/wp-content/plugins/author-box-with-different-description/author_box_display.php on line 152

The declaration of main can be done as

int main()

One more declaration that can be taken by main is command line arguments form

int main(int argc, char *argv[]) 

or this can also be written as

int main(argc, argv)
int argc;
char *argv[];

NOTE: It is not possible for one to declare the main() as void. This is because the function main() returns int only and if the function is declared as returning void by statement void main() there is mismatch in declaration and hence it will not work. main() must be declared as returning int which takes the form by int main() or simple main() meaning int value returned.