/**
 * A gentle intro to structs.
 * Illustrates lots of points
 * 
 * @author gtowell
 * Created March 20, 2021
 * **/

#include <stdio.h>

// define a struct
struct p {
    int a;
    int b;
};

// define a struct using typedef
typedef struct {
    int a;
    int b;
} pType;

//print constent of struct using basic define
void printit(struct p pa) {
    printf("struct p %d %d %d\n", &pa, pa.a, pa.b);
}
// print contents of struct using typedef
void printitPT(pType pa) {
    printf("pType %d %d %d\n", &pa, pa.a, pa.b);
}
// print contents of struct, when passed by reference
void printitPoint(pType * paP) {
    // note use of two ways to get to pointed to struct contents
    // -> is just shorthand and is supposed to be easier.
    printf("pType* %d %d %d\n", paP, (*paP).a, paP->b);
}

int main(int argc, char const *argv[])
{
    struct p aa;
    aa.a = 5; aa.b = 10;
    pType bb = {.a=6, .b=12};
    printf("Pointers %d  %d\n", &aa, &bb);
    printit(aa);
    printitPT(bb);
    printitPoint(&bb);
    return 0;
}