C Language: PlaceList TXT File: Vancouver International Airport Canada 49.196691

Question

C Language:

PlaceList TXT File:

Vancouver International Airport
Canada
49.196691
-123.181512
Tucson International Airport
USA
32.114510
-110.939227
University of Arizona
USA
32.231885
-110.950109
Statue of Liberty
USA
40.689249
-74.044500
Big Ben
UK
51.500729
-0.124625
Forbidden City
China
39.916345
116.397155
Sydney Opera House
Australia
-33.856784
151.215297
Ministro Pistarini International Airport
Argentina
-34.815004
-58.534828
Colosseo
Italy
41.890210
12.492231
Golden Gate Bridge
USA
37.819929
-122.478255

Explanation / Answer

Hi, I have answered this question earlier. Giving you the same code.

#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
typedef struct place_s{
char name[100];
char country[30];
double latitude;
double longitude;
double distance;
}place;
double dist(double lat1, double long1, double lat2, double long2);
void swap(place *p1, place *p2);
void selection(place p[], int size);
int readFile(char *filename, place p[]);
void showNotInUSA(place p[], int n);
void showSortedFromTucson(place p[], int n);

int main()
{
int n;
place p[100];
  
n = readFile("placelist.txt", p);
showNotInUSA(p, n);
printf(" ============================================ ");
showSortedFromTucson(p, n);
}

double dist(double lat1, double long1, double lat2, double long2)
{
double R = 6371;
double PI = 3.1415926536;
double dx, dy, dz;
double dist_mile;
  
long1 = long1 - long2;
long1 = long1 * (PI / 180);
lat1 = lat1 * (PI / 180);
lat2 = lat2 * (PI / 180);
  
dz = sin(lat1) - sin(lat2);
dx = (cos(long1) * cos(lat1)) - cos(lat2);
dy = sin(long1) * cos(lat1);
dist_mile = (asin(sqrt(dx * dx + dy * dy + dz * dz) / 2) * 2 * R) / 1.609344;
return dist_mile;
}
void swap(place *p1, place *p2)
{
place temp = *p1;
*p1 = *p2;
*p2 = temp;
}
void selection(place p[], int size)
{
int i, j;
int min;
for(i = 0; i < size; i++)
{
min = i;
for( j = i; j < size; j++){
if(p[j].distance < p[min].distance)
min = j;
}
swap(&p[i], &p[min]);
}
}
int readFile(char *filename, place p[])
{
int n = 0;
FILE *fp = fopen(filename ,"r");
int len ;
if(fp == NULL)
{
printf("Could not open input file %s ", filename);
exit(1);
}
while(fgets(p[n].name, 100, fp))
{
fgets(p[n].country, 30, fp);
fscanf(fp, "%lf %lf", &p[n].latitude, &p[n].longitude);
fgetc(fp); //get rid of newline before reading a string next iteration
//remove the from both country and place names, fgets() returns the also
len = strlen(p[n].name);
p[n].name[len - 1] = '';
len = strlen(p[n].country);
p[n].country[len - 1] = '';
  
  
n++;
}
fclose(fp);
return n;
}
void showNotInUSA(place p[], int n)
{
int i;
printf("Places in database NOT in USA ");
for(i = 0; i < n; i++)
{
if(strcmp(p[i].country, "USA") != 0) //not USA
{
printf("%s, %s ", p[i].name, p[i].country);
printf("[Latitude, Longitude] = [%lf, %lf] ", p[i].latitude, p[i].longitude);
  
}
}
}
void showSortedFromTucson(place p[], int n)
{
double Tucson_lat = 32.225750;
double Tucson_long = -110.979413;
int i ;
  
//calculate distances for all
for(i = 0; i < n; i++)
p[i].distance = dist(p[i].latitude, p[i].longitude, Tucson_lat, Tucson_long);
  
//sort them
selection(p, n);
  
//display
printf("Places in database sorted by distance from Tucson city center ");
printf("(Its latitude and longitude are %lf and %lf) ", Tucson_lat, Tucson_long);
  
for(i = 0; i < n; i++)
{
printf("%s, %s ", p[i].name, p[i].country);
printf("[Latitude, Longitude] = [%lf, %lf] ", p[i].latitude, p[i].longitude);
printf("Distance is %.3lf miles ", p[i].distance);
}
}



output
======
Places in database NOT in USA
Vancouver International Airport, Canada
[Latitude, Longitude] = [49.196691, -123.181512]
Big Ben, UK
[Latitude, Longitude] = [51.500729, -0.124625]
Forbidden City, China
[Latitude, Longitude] = [39.916345, 116.397155]
Sydney Opera House, Australia
[Latitude, Longitude] = [-33.856784, 151.215297]
Ministro Pistarini International Airport, Argentina
[Latitude, Longitude] = [-34.815004, -58.534828]
Colosseo, Italy
[Latitude, Longitude] = [41.890210, 12.492231]

============================================
Places in database sorted by distance from Tucson city center
(Its latitude and longitude are 32.225750 and -110.979413)
University of Arizona, USA
[Latitude, Longitude] = [32.231885, -110.950109]
Distance is 1.764 miles
Tucson International Airport, USA
[Latitude, Longitude] = [32.114510, -110.939227]
Distance is 8.037 miles
Golden Gate Bridge, USA
[Latitude, Longitude] = [37.819929, -122.478255]
Distance is 755.920 miles
Vancouver International Airport, Canada
[Latitude, Longitude] = [49.196691, -123.181512]
Distance is 1331.545 miles
Statue of Liberty, USA
[Latitude, Longitude] = [40.689249, -74.044500]
Distance is 2117.048 miles
Big Ben, UK
[Latitude, Longitude] = [51.500729, -0.124625]
Distance is 5300.223 miles
Ministro Pistarini International Airport, Argentina
[Latitude, Longitude] = [-34.815004, -58.534828]
Distance is 5746.655 miles
Colosseo, Italy
[Latitude, Longitude] = [41.890210, 12.492231]
Distance is 6183.815 miles
Forbidden City, China
[Latitude, Longitude] = [39.916345, 116.397155]
Distance is 6603.798 miles
Sydney Opera House, Australia
[Latitude, Longitude] = [-33.856784, 151.215297]
Distance is 7815.125 miles

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