I don't even know. why does nothing work????
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Shaquille Soekhlal
232
Assignment 10/main.c
Normal file
232
Assignment 10/main.c
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/*
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* Student: S.K. Soekhlal
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* Number: 4860632
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* Assignment: 5.1 + 5.2
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include "salloc.h"
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#include "city.h"
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#include "road.h"
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#define MAX_STRING_LENGTH 50
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/*
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* Locate city with name city_name on the map
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*/
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City *find_city (City *list_of_cities, char *city_name)
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{
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City *c = list_of_cities;
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while (c != NULL)
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{
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if (strcmp (c->name, city_name) == 0)
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return c;
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c = c->next;
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}
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return NULL;
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}
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/*
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* Delete a map
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*/
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static void delete_map (City *map)
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{
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City *map_copy;
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while (map != NULL)
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{
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map_copy = map;
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map = map->next;
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delete_city (map_copy);
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}
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}
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/*
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* Build the map datastructure
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*/
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static City *create_map (FILE *data_file)
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{
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int num_of_cities, i;
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int length_of_road;
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char city_begin[MAX_STRING_LENGTH + 1];
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char city_end[MAX_STRING_LENGTH + 1];
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int num_of_roads;
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char city_name[MAX_STRING_LENGTH + 1];
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City *map = NULL;
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/* Read in city-names */
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fscanf (data_file, "%d", &num_of_cities);
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for (i = 0; i < num_of_cities; i++)
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{
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City *city;
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City *c;
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fscanf (data_file, "%s", city_name);
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if (find_city (map, city_name) != NULL)
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{
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fprintf (stderr, "City %s already on the map\n", city_name);
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delete_map (map);
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exit (EXIT_FAILURE);
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}
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city = new_city (safe_strdup (city_name));
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if (map == NULL)
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/* This is the first city of the map */
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map = city;
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else {
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/* Find last of city list */
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c = map;
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while (c->next) c = c->next;
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/* And append new city there */
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c -> next = city;
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}
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}
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fscanf (data_file, "%d", &num_of_roads);
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for (i = 0; i < num_of_roads; i++){
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City *city;
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Road *c;
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Road *road;
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Road *origin;
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Road *destination;
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fscanf(data_file,"%s %s %d", city_begin,city_end, &length_of_road);
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origin = (Road*)find_city(map,city_begin);
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destination = (Road*)find_city(map,city_end);
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road = new_road((City*)origin, (City*)destination, (int)length_of_road);
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city = (City*)origin;
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if (city->roads == NULL){
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/* This is the first road of the city*/
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city->roads = road;
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}
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else {
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/* Find last of road list */
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c = city->roads;
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while (c->next) c = c->next;
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/* And append new road there */
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c -> next = road;
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}
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}
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return map;
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}
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static void print_city_roads (City *map)
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{
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City *city;
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Road *road;
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for (city = map; city != NULL; city = city->next)
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{
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printf ("Roads from city %s:\n", city->name);
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for (road = city->roads; road != NULL; road=road->next) {
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printf (" to city %s", road->destination->name);
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printf (" (length %d)\n", road->length);
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}
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}
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free(city);
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free(road);
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}
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static void find_shortest_roads (City *map)
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{
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char buf[MAX_STRING_LENGTH];
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char *destination;
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int length;
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int smallest_length;
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City *city;
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Road *road;
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scanf("%s", buf);
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city = find_city(map,buf);
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road = city->roads;
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smallest_length = road->length;
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destination = road->destination->name;
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while(strcmp(buf,"0") != 0){
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int a = 1;
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city = find_city(map,buf);
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if(road == NULL){
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printf("There is no road from city %s\n",buf);
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}else{
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for (road = city->roads; road != NULL; road=road->next) {
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if(a || road->length <= smallest_length){
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smallest_length = road->length;
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destination = road->destination->name;
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a=0;/*to set smallest length to some value*/
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}
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/*shortest road found*/
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}
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length = smallest_length;
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printf("Shortest road from city %s is to city %s: %d\n", buf, destination, length);
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}
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scanf("%s", buf);
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}
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free(city);
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free(road);
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}
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int main (int argc, char *argv[])
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{
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FILE *data_file = NULL;
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City *map = NULL;
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/* Check arguments */
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if (argc != 2)
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{
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fprintf (stderr, "Usage: %s <datafile>\n", argv[0]);
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exit (EXIT_FAILURE);
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}
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/* Open data-file */
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if ((data_file = fopen (argv[1], "r")) == NULL)
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{
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fprintf (stderr, "Error opening file <%s>\n", argv[1]);
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exit (EXIT_FAILURE);
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}
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/* Create map-data-structure */
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if ((map = create_map (data_file)) == NULL)
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{
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fprintf (stderr, "No map data found\n");
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exit (EXIT_FAILURE);
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}
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print_city_roads (map);
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find_shortest_roads (map);
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/* Outit */
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if (data_file != NULL)
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fclose (data_file);
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if (map != NULL)
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delete_map (map);
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return EXIT_SUCCESS;
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}
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