55 lines
1.0 KiB
C
55 lines
1.0 KiB
C
#include "a_train.h"
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#include <stdio.h>
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struct car* add_car(struct car* first,const char* target) {
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struct car *newCar = calloc(1,sizeof(struct car));
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strcpy(newCar->value,target);
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if(first==NULL){
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first = newCar;
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}else{
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struct car* this = first;
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while(this->next!=NULL){
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this = this->next;
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}
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this->next = newCar;
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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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for(struct car* this = first;this!=NULL;this = this->next){
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printf("%s\n",this->value);
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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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return;
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}
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cancel_train(first->next);
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free(first);
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}
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struct car* clear_train(struct car* first, const char* target) {
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struct car *previous = NULL;
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for(struct car *this = first;this!=NULL;this=this->next){
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if(strcmp(this->value,target)==0){
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if(previous==NULL){
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first = first->next;
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free(this);
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break;
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}else{
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previous->next = this->next;
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free(this);
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break;
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}
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}
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previous = this;
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}
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return first;
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}
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