du4

du4/Makefile

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+TARGET = train
+
+CC = gcc
+
+CFLAGS = -Wall -Wextra -std=c11 -g
+
+OBJS = main.o a_train.o
+
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+	$(CC) $(CFLAGS) -o $(TARGET) $(OBJS)
+
+main.o: main.c a_train.h
+	$(CC) $(CFLAGS) -c main.c
+
+a_train.o: a_train.c a_train.h
+	$(CC) $(CFLAGS) -c a_train.c
+
+clean:
+	rm -f $(OBJS) $(TARGET)
+
+run: $(TARGET)
+	./$(TARGET)

du4/a_train.c

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+#include "a_train.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+//pridaj vozen na koniec spojkového zoznamu
+struct car* add_car(struct car* first, const char* target) {
+    // alokacia noveho prvku
+    struct car* newcar = calloc(1, sizeof(struct car));
+    if (newcar == NULL) {
+        fprintf(stderr, "Chyba: nepodarilo sa alokovať pamäť pre nový vozeň.\n");
+        return first;
+    }
+
+    // kopirujeme cielovu stanicu
+    strcpy(newcar->value, target);
+    newcar->next = NULL;
+
+    // vlak prazdny -> novy vozen je prvy
+    if (first == NULL) {
+        return newcar;
+    }
+
+    // inak pridame na koniec
+    struct car* this = first;
+    while (this->next != NULL) {
+        this = this->next;
+    }
+    this->next = newcar;
+
+    return first;
+}
+
+// vypis voznov
+void print_train(struct car* first) {
+    struct car* this = first;
+    while (this != NULL) {
+        printf("%s\n", this->value);
+        this = this->next;
+    }
+}
+
+// zrusit vlak a uvolnit pamat
+void cancel_train(struct car* first) {
+    if (first == NULL) return;
+
+    // Rekurzívne uvoľnenie
+    cancel_train(first->next);
+    free(first);
+}
+
+// odstranit vozne s target stanicou
+struct car* clear_train(struct car* first, const char* target) {
+    struct car* current = first;
+    struct car* prev = NULL;
+
+    while (current != NULL) {
+        if (strcmp(current->value, target) == 0) {
+            // vymazat zaznam
+            struct car* to_delete = current;
+            current = current->next;
+
+            if (prev == NULL) {
+                // vymazat prvy prvok
+                first = current;
+            } else {
+                prev->next = current;
+            }
+
+            free(to_delete);
+        } else {
+            // Pokračujeme ďalej
+            prev = current;
+            current = current->next;
+        }
+    }
+
+    return first;
+}

du4/a_train.h

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+#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

du4/main.c

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+#include "a_train.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main() {
+    struct car* train = NULL;
+    char name[SIZE];
+
+    printf("Zadajte zoznam cieľových staníc (ukončite prázdnym riadkom):\n");
+    while (1) {
+        if (fgets(name, SIZE, stdin) == NULL) break;
+        // odstranit '\n'
+        name[strcspn(name, "\n")] = '\0';
+        if (strlen(name) == 0) break;
+        train = add_car(train, name);
+    }
+
+    printf("\nZadajte stanicu, ktorá sa má vyradiť:\n");
+    fgets(name, SIZE, stdin);
+    name[strcspn(name, "\n")] = '\0';
+
+    train = clear_train(train, name);
+
+    printf("\nVýsledný vlak bez stanice %s bude:\n", name);
+    print_train(train);
+
+    cancel_train(train);
+    return 0;
+}