/*
 * programming_structures_fns.c
 *
 *  Created on: Apr 14, 2023
 *      Author: johnsontimoj
 */
//////////////////////////////////
//
// practice with structures in functions
//
// inputs - user
// outputs - prints
//
//////////////////////////
#include <stdio.h>

////////////////////////
// structs DEFINED in global area so all functions
// know about the new type
// Note: we Do NOT create structs here
///////////////////////

// Define a structure using tag
///////////////////
// structure: vacation
//
// holds a number and travel distance for a vacation trip
///////////////////
struct vacation{
	int vac_no;
	float vac_dist;
};

// Define a new type that is a structure
////////////////////
// structure: trip
//
// holds the mpg and type of trip (w- work, f - family, e - errand)
////////////////////
typedef struct{
	float mpg;
	char trip_type;
}trip;

// Function Prototypes - After structure definitions so they know what the structures are
void print_vacation(struct vacation my_vac);
void print_vacation_ptr(const struct vacation * vac_ptr);
void print_trip(trip my_trip);
void print_trip_ptr(const trip * trip_ptr);
trip load_trip(void);

int main(void){
    setbuf(stdout, NULL); // fix buffer problem

    // splash - no function to save time
    printf("\n\nStructure program with Functions\n\n");

    // create a new structure using the tag approach
    struct vacation yosemite;
    yosemite.vac_no = 3;
    yosemite.vac_dist = 1234.5;
    print_vacation(yosemite);

    // use a pointer to pass the structure
    print_vacation_ptr(&yosemite);

    // create a new structure using the typedef approach
    trip work;
    work.trip_type = 'w';
    work.mpg = 32.35;
    print_trip(work);

    // use a pointer to pass the structure
    // note: skip creating a separate variable by using &work
    print_trip_ptr(&work);

    // load a new structure using a function
    trip new_trip;
    new_trip = load_trip();
    print_trip(new_trip);

    return 0;
}// end main

////////////////////////////////////
// print_vacation
//
// prints a structure of type vacation
//
// inputs: the structure
// outputs: print
//////////////////////////////////
void print_vacation(struct vacation my_vac){
	printf("I traveled %f miles on vacation number %i\n", my_vac.vac_dist, my_vac.vac_no);

	return;
}// end print_vacation

////////////////////////////////////
// print_vacation_ptr
//
// prints a structure of type vacation via a pointer
//
// inputs: pointer to the structure
// outputs: print
//////////////////////////////////
void print_vacation_ptr(const struct vacation * vac_ptr){
	printf("I traveled %f miles on vacation number %i\n", vac_ptr->vac_dist, vac_ptr->vac_no);

	return;
}// end print_vacation

////////////////////////////////////
// print_trip
//
// prints a structure of type trip
//
// inputs: the structure
// outputs: print
//////////////////////////////////
void print_trip(trip my_trip){
	printf("I averaged %f mpg on my trip of type %c\n", my_trip.mpg, my_trip.trip_type);

	return;
}// end print_vacation

////////////////////////////////////
// print_trip_ptr
//
// prints a structure of type trip via a pointer
//
// inputs: pointer to the structure
// outputs: print
//////////////////////////////////
void print_trip_ptr(const trip * trip_ptr){
	printf("I averaged %f mpg on my trip of type %c\n", trip_ptr->mpg, trip_ptr->trip_type);

	return;
}// end print_vacation

////////////////////////////////////
// load_trip
//
// requests values for and returns a structure of type trip
//
// inputs: none
// outputs: returns a structure of type trip
//////////////////////////////////
trip load_trip(void){
	trip tmp;
	printf("enter the type of the trip (w- work, f - family, e - errand): ");
	scanf("%c", &(tmp.trip_type));
	printf("enter the mpg for this trip: ");
	scanf("%f", &(tmp.mpg));

	return tmp;
}// end load_trip