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Makefile

@@ -0,0 +1,13 @@
+CFLAGS= -std=c99 -g -Wall
+
+all: train
+
+%.o: %.c
+	gcc -c -o $@ $< $(CFLAGS)
+
+train: main.o a_train.o
+	gcc main.o a_train.o -o train 
+
+clean:
+	rm *.o train
+

a_train.c

@@ -0,0 +1,149 @@
+#include "a_train.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int getLength(struct car* first) {
+
+	if (first != NULL) {
+
+		int count = 1;
+
+		while (first->next != NULL) {
+
+			count++;
+			first = first->next;
+
+		}
+
+		return count;
+
+	} else {
+
+		return 0;
+
+	}
+
+}
+
+struct car* getLast(struct car* first) {
+
+	if (first == NULL) return NULL;
+
+	while (first->next != NULL) first = first->next;
+
+	return first;
+
+}
+
+struct car* getLastButOne(struct car* first) {
+
+	if (first == NULL || first->next == NULL) return NULL;
+
+	while (first->next->next != NULL) first = first->next;
+
+	return first;
+
+}
+
+struct car* add_car(struct car* first, const char* target) {
+
+	struct car* newcar = calloc(1,sizeof(struct car));
+
+	strcpy(newcar->value, target);
+	newcar->next = NULL;
+
+	if (first == NULL) return newcar;
+
+	struct car* last = getLast(first);
+
+	last->next = newcar;
+
+	return first;
+
+}
+
+void print_train(struct car* first) {
+
+	if (first == NULL) return;
+
+	struct car* this = first;
+
+	printf("\nTrain way:\n\n");
+	printf("%s", this->value);
+
+	while (this->next != NULL) {
+
+		this = this->next;
+		printf(" -> ");
+		printf("%s", this->value);
+
+	}
+
+	printf("\n\n");
+
+}
+
+void popBack(struct car* first) {
+
+	if (first == NULL) { printf("123"); return; }
+
+	struct car* lastbo = getLastButOne(first);
+
+	if (lastbo == NULL) {
+		
+		free(first);
+		first = NULL;
+
+	} else {
+
+		free(lastbo->next);
+		lastbo->next = NULL;
+
+	}
+
+}
+
+void cancel_train(struct car* first) {
+
+	if (first == NULL) return;
+
+	while (first->next != NULL) popBack(first);
+
+	free(first);
+	first = NULL;
+
+}
+
+struct car* clear_train(struct car* first, const char* target) {
+
+	if (first == NULL) return NULL;
+
+	// while (first->next->next != NULL) {
+
+	// 	if (strcmp(first->next->value, target) == 0) {
+
+	// 		struct car* node = first->next->next;
+
+	// 		free(first->next);
+
+	// 		first->next = node;
+
+	// 	}
+
+	// }
+
+	struct car* this = first;
+
+	if (strcmp(first->value, target) == 0) {
+
+		this = this->next;
+
+		free(first);
+
+	}
+
+	return this;
+
+}
+

a_train.h

@@ -0,0 +1,51 @@
+#ifndef TRAIN_H
+#define TRAIN_H
+#define SIZE 100
+
+/**
+ * Jeden vozen vlaku
+ */
+struct car {
+	/**
+	 * Nazov cielovej  stanice
+	 */
+	char value[SIZE];
+	/**
+	 * Smenik na dalsi vozen
+	 */
+	struct car* next;
+};
+
+/**
+ * Prida vozen na koniec vlaku.
+ *
+ * @arg nazov cielovej stanice, ktory sa ma priradit novemu voznu.
+ * @return smernik na zaciatok vlaku.
+ */
+struct car* add_car(struct car* first,const char* target);
+
+
+/**
+ * Vypise vsetky vozne vo vlaku
+ *
+ * @arg smernik na prvy vozen
+ */
+void print_train(struct car* first);
+
+/**
+ * Zrusenie vsetkych voznov vo vlaku.
+ * @arg smernik na prvy vozen
+ */
+void cancel_train(struct car* first);
+
+/**
+ * Vyradenie vsetkych voznov, ktorych cielova stanica je target
+ *
+ * @arg smernik na prvy vozen
+ * @arg cielova stanica, ktora sa ma vyradit z vlaku.
+ * @return smernik na novy prvy vozen
+ *
+ */
+struct car* clear_train(struct car* first,const char* target);
+
+#endif // TRAIN_H

main.c

@@ -0,0 +1,29 @@
+#include "a_train.h"
+#include <stdio.h>
+#include <string.h>
+
+// Testovaci subor pre vlak
+int main(void){
+
+	struct car* train = NULL; 
+
+	train = add_car(train, "Presov");
+	train = add_car(train, "Presov");
+	train = add_car(train, "Presov");
+	train = add_car(train, "Presov");
+	train = add_car(train, "Presov");
+	train = add_car(train, "Presov");
+	train = add_car(train, "Bratislava");
+	train = add_car(train, "Levoca");
+	train = add_car(train, "Spiska Nova Ves");
+	print_train(train);
+
+	train = clear_train(train, "Presov");
+	print_train(train);
+
+	// cancel_train(train);
+	// print_train(train);
+
+	return 0;
+
+}