// Introducing you to the user defined data structure - STRUCT
// It is basically a mixed bag of tricks that you are in charge of
// Sasha Vassar Week 2 Lecture 3

// Three main points to a struct:
// 1. Define (define what is in this mixed bag of tricks)
// 2. Declare (let the program know I will be using this structure, and the variable name I will use that will use this type of structure)
// 3. Initialise (Access the members of the struct to assign them some values

// YAY! You are now a wizard (wizardess, witch?) who can define their
// own data types

#include <stdio.h>

//1. Define
struct coordinate {
    int x;
    int y;
}; 

// Problem: I have the coordinate points of two points and want
// to compute the midpoint of the line the two points make (formula
// for midpoint ((x1+x2)/2, (y1+y2)/2)   


int main (void) {

    //2. Declare
    struct coordinate point_one;
    struct coordinate point_two;
    double midpoint_x;
    double midpoint_y;
    int scanf_return;

    //3. Initialise
    printf("Please enter the x and y coordinates of point one: ");
    scanf_return = scanf("%d %d", &point_one.x, &point_one.y);
    
    if (scanf_return != 2) {
        printf("You did not enter two coordinate points.\n");
        return 1;
    } 
    
    printf("Please enter the x and y coordinates of point two: ");
    scanf("%d %d", &point_two.x, &point_two.y);
    
    if (scanf_return != 2) {
        printf("You did not enter two coordinate points.\n");
        return 1;
    } 
    
    midpoint_x = (point_one.x + point_two.x) / 2.0;
    midpoint_y = (point_one.y + point_two.y) / 2.0;
    
    printf("Point one (%d, %d)\nPoint two (%d, %d)\nThey  have the midpoint (%.1lf, %.1lf)\n", point_one.x, point_one.y, point_two.x, point_two.y, midpoint_x, midpoint_y);

    return 0;
}