C Homework 6 - due 04/20

1. Assignment

Write code that 

(a) reads-in data from the file stores.txt, 
(b) prompts the user to enter his/her location, 
(c) prints out the name and distance to the closest store

You should create your own stores.txt.  It should contain exactly 10 stores and have the following format:

- name of the store (at most 20 characters)
- x coordinate of the store (0 <= x <= 100)
- y coordinate of the store (0 <= y <= 100)

To work on this assignment, start with the file geolocation_reference.c.

Call your program closest_store.c and submit it via Webcourses.

2. Extra credit assignment

Instead of just printing the closest store in (c), print out the stores in non-decreasing 
distance to the user.

After initializing the array
  stores_t stores[NUMSTORES]
you are not allowed to swap data inside this array.  Instead you should only swap the entries of
  int index_array[NUMSTORES]
and pick the right stores indirectly by using index_array like so:
For instance, after sorting, the names of the closest and second closest store are
  stores[index_array[0]].name
  stores[index_array[1]].name


Example file store.txt:

Starbucks 63 29
BestBuy 46 72
Target 53 35
Lowes 100 6
Walmart 2 35
HomeDepot 36 33
Publix 18 25
Pats 20 14
Shamrock 77 77
Catalyst 62 38

Corresponding output:

Enter the coordinates of your location (x, y): 1 15
Store Pats                 (20.00, 14.00) is 19.03 units away
Store Publix               (18.00, 25.00) is 19.72 units away
Store Walmart              ( 2.00, 35.00) is 20.02 units away
Store HomeDepot            (36.00, 33.00) is 39.36 units away
Store Target               (53.00, 35.00) is 55.71 units away
Store Starbucks            (63.00, 29.00) is 63.56 units away
Store Catalyst             (62.00, 38.00) is 65.19 units away
Store BestBuy              (46.00, 72.00) is 72.62 units away
Store Shamrock             (77.00, 77.00) is 98.08 units away
Store Lowes                (100.00, 6.00) is 99.41 units away