87 lines
1.7 KiB
C
Executable File
87 lines
1.7 KiB
C
Executable File
#include "a_train.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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struct car* add_car(struct car* first,const char* target) {
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struct car* new_car = (struct car*)calloc(1,sizeof(struct car));
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strcpy(new_car->value, target);
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new_car->next = NULL;
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if (first == NULL){
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first = new_car;
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}
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else {
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struct car* temp=first;
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while(temp->next != NULL){
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temp = temp->next;
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}
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temp->next = new_car;
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}
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return first;
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}
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void print_train(struct car* first) {
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struct car* this = first;
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while(this != NULL){
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printf("%s->",this->value);
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this = this->next;
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}
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}
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void cancel_train(struct car* first) {
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if (first != NULL){
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cancel_train(first->next);
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free(first);
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}
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}
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struct car* clear_train(struct car* first, const char* target) {
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struct car* this = first;
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if (this == NULL){
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return NULL;
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}
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if (this->next == NULL){
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if(strcmp(this->value, target) == 0){
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free(this);
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return NULL;
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}else {
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return this;
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}
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}
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/*if(this->next->next == NULL){
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if(strcmp(this->value, target) == 0){
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struct car* tmp = this->next;
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free(this);
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return tmp;
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}else if(strcmp(this->next->value, target) == 0){
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free(this->next);
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this->next=NULL;
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return this;
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}
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}*/
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while( this->next->next != NULL){
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if(strcmp(this->next->value, target) == 0){
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struct car* third = this->next->next;
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free(this->next);
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this->next = third;
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return this;
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}
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else {
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this = this->next;
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}
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}
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if(strcmp(this->value, target) == 0){
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struct car* tmp = this->next;
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free(this);
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return tmp;
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}else if(strcmp(this->next->value, target) == 0){
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free(this->next);
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this->next=NULL;
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return this;
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}
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return first;
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}
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