function pointer in c

Function pointer in c - a simple code using struct. The same concept I saw in device driver development. So to get a clear concept I did this code.

#include <stdio.h>

struct file_ops {
        int number;
        int ( *open ) ( int );
};

int function_open ( int );

struct file_ops

fops = {
        open: function_open,
},

gops =  {
        open:function_open,
};

int main ( void )
{
        fops.number = 10;
        fops.open ( fops.number );

        gops.number = 20;
        gops.open ( gops.number );

        return 0;
}

int function_open ( int a ) {
        static int j = 0;
        printf ( "The number is : %d\n", a );
        j++;
        printf ( "The count is : %d\n", j );
        return a;
}

Read this post to know how to add source code snippet to blogger.