usaa20/cv5/a_train.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "a_train.h"

struct car* add_car(struct car* first,const char* target) {
    struct car* newcar = calloc(1, sizeof(struct car));
    strcpy(newcar->value, target);
    if(first == NULL){
        first = newcar;
    }
    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;
    if(first == NULL){
        printf("List is empty."); 
        return;   
    }
    else{
        while(this != NULL){
            printf("%s\n", this->value);
            this = this->next;
        }
    }
}


void cancel_train(struct car* first) {
    if(first != NULL){
        cancel_train(first->next);
        free(first);
    }
}


struct car* clear_train(struct car* first, const char* target) {
    struct car* this = first;
    while(this != NULL){
        if(this->value == target){
            return NULL;    
        }
        this = this->next;
        
    }
    return first;
}