/* DO NOT TRACE this program, just predict the output produced */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define kNameLength 20

typedef struct
{
    char name[kNameLength];
    int miles;
} city_t;

/* Find the closest of two cities */
city_t compare_cities(const city_t city1,
                   const city_t city2);

int main(void)
{
    const city_t cities[81] =
        {
            {"",0},
            {"Acapulco",       2260}, {"Amsterdam",      3639},
            {"Antigua",        1783}, {"Aruba",          1963},
            {"Athens",         4927}, {"Barbados",       2100},
            {"Bermuda",         771}, {"Bogota",         2487},
            {"Brussels",       3662}, {"Buenos Aires",   5302},
            {"Caracas",        2123}, {"Copenhagen",     3849},
            {"Curacao",        1993}, {"Frankfurt",      3851},
            {"Geneva",         3859}, {"Glasgow",        3211},
            {"Hamburg",        3806}, {"Kingston",       1583},
            {"Lima",           3651}, {"Lisbon",         3366},
            {"London",         3456}, {"Madrid",         3588},
            {"Manchester",     3336}, {"Mexico City",    2086},
            {"Milan",          4004}, {"Nassau",         1101},
            {"Oslo",           3671}, {"Paris",          3628},
            {"Reykjavik",      2600}, {"Rio de Janeiro", 4816},
            {"Rome",           4280}, {"San Juan",       1609},
            {"Santo Domingo",  1560}, {"St. Croix",      1680},
            {"Tel Aviv",       5672}, {"Zurich",         3926}
        };
    int one;
    int two;
    int city;
    city_t closest;
    
    for (city = 1; city < 12; city+=2)
    {
         printf("%d %s \t%d %s\n",city, cities[city].name, 
                                 city+1, cities[city+1].name);
    }       
    
    printf("Enter two city numbers: ");
    scanf("%d%d", &one, &two);

    printf("%s is %d miles from New York City.\n",
             cities[one].name, cities[one].miles);
    printf("%s is %d miles from New York City.\n",
             cities[two].name, cities[two].miles);

    closest = compare_cities(cities[one],cities[two]);
    printf("%s is closer.\n", closest.name);

    return 0;
}

city_t compare_cities(const city_t city1,
                   const city_t city2)
{
    if (city1.miles < city2.miles)
    {
       return city1;
    }
    else
    {
       return city2;
    }  
}