1

a_train.c

@@ -1,18 +1,95 @@
 #include "a_train.h"
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 struct car* add_car(struct car* first,const char* target) {
-    return NULL;
+    struct car* newcar = (struct car*)malloc(sizeof(struct car));
+    strcpy(newcar->value, target);
+    newcar->next = NULL; 
+    if(first == NULL){
+        first = newcar;
+        return first;
+    }else{
+        struct car* this = first;
+        while(this->next != NULL){
+            this = this->next;
+        }
+        this->next = newcar;
+               
+       
+        
+        
+    }
+   
+    return first;
 }
 
 void print_train(struct car* first) {
+    struct car* this = first;   
+    while(this != NULL){
+        printf("%s \n",this->value);
+        this = this->next;
+    }
+    printf("\n");
 }
 
 void cancel_train(struct car* first) {
+   /* if (first!=NULL){
+        cancel_train(first->next);
+        free(first);
+        first = NULL;
+    }*/
+     
+    struct car* next; 
+    while (first != NULL)  { 
+        next = first->next; 
+        free(first); 
+        first = next; 
+    } 
+    first = NULL;
 }
 
 
 struct car* clear_train(struct car* first, const char* target) {
+    if(first == NULL){
         return NULL;
+    }
+    if(first->next == NULL){
+        if(strcmp(first->value,target)== 0){
+            return NULL;
+        }else{
+            return first;
+        }
+    }
+    struct car* prev = first;
+   /* if(strcmp(prev->value,target)== 0){
+        struct car* one = prev->next;
+        free(prev);
+        prev= one;
+        //free(one);
+        //one = NULL;
+        return first;
+    }*/
+    while (prev->next->next != NULL){
+        if(strcmp(prev->next->value,target)== 0){
+            struct car* third = prev->next->next;
+            free(prev->next);
+            prev->next = third;
+            return first;
+        }
+        prev = prev->next;
+    }
+    if(strcmp(prev->next->value,target)== 0){
+            
+        free(prev->next);
+        prev->next = NULL;
+        return first;
+    }
+  
+
+    
+    
+	return first;
 }
 

main.c

@@ -1,17 +1,37 @@
 #include "a_train.h"
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 // Testovaci subor pre vlak
 int main(){
+   
     struct car* train = NULL;
+ /*   int c=0;
+    printf("Zadajte nazov stanice a pocet cestujucich. \n Ukoncite prazdnym riadkom \n");
+        
+   
+    char i[100];
+    while (strcmp(i, "\n") != 0) {
+        c++;
+        fgets(i, 100, stdin);
+
+        if(c%2 != 0){
+            train = add_car(train,i);
+        }
+        printf("%s \n",i);
+        
+   
+    
+    }*/
+    //struct car* train = NULL;
     train = add_car(train,"Presov");
-    train = add_car(train,"Bratislava");
     train = add_car(train,"Levoca");
+    train = add_car(train,"Bratislava");
     train = add_car(train,"Spiska Nova Ves");
     print_train(train);
     clear_train(train,"Levoca");
     print_train(train);
     cancel_train(train);
-
     return 0;
 }