/*
    In this example we demonstrate a function that takes as parameter a
    pointer to structure (struct POINT)
*/

#include <stdio.h>
#include <conio.h>

/* struct POINT declaration */
struct POINT {
    float x;
    float y;
};

/* function doublePOINT prototype */
/*
    Function doublePOINT takes as parameter a pointer to struct POINT
    and doubles the field values.
*/
void doublePOINT( struct POINT *);

/* function printPOINT prototype */
/*
    Function printPOINT prints the fields of a struct POINT to screen
*/
void printPOINT( struct POINT );

void main()
{
    struct POINT p;
    p.x = 1;
    p.y = 1;
    printPOINT( p );
    doublePOINT( &p ); /* The symbol &p corresponts to the memory reference */
                         /* of struct POINT p. */
    printPOINT( p );
    getch();
}

void doublePOINT( struct POINT *p)
{
    p->x *= 2;
    p->y *= 2;
}

void printPOINT( struct POINT p)
{
    printf("x = %f.\ny = %f.\n\n",p.x,p.y);
}

© 2004 Jim Valavanis