100 lines
1.5 KiB
C
100 lines
1.5 KiB
C
#include <stdio.h>
|
|
#include"a_train.h"
|
|
|
|
|
|
|
|
struct car* add_car(struct car* first,const char* target)
|
|
{
|
|
struct car* ret=first;
|
|
struct car* nc=(struct car*) malloc(sizeof(struct car));
|
|
strcpy(nc->value, target);
|
|
nc->next=NULL;
|
|
|
|
if(first)
|
|
{
|
|
while(first->next!=NULL)
|
|
{
|
|
first=first->next;
|
|
}
|
|
first->next=nc;
|
|
return ret;
|
|
}
|
|
|
|
first=nc;
|
|
|
|
return first;
|
|
}
|
|
|
|
void print_train(struct car* first)
|
|
{
|
|
if(first==NULL)
|
|
{
|
|
|
|
return;
|
|
}
|
|
|
|
do
|
|
{
|
|
printf("%s", first->value);
|
|
first=first->next;
|
|
if(first) printf("->");
|
|
}while(first!=NULL);
|
|
|
|
}
|
|
|
|
void cancel_train(struct car* first)
|
|
{
|
|
struct car* t;
|
|
while(first!=NULL)
|
|
{
|
|
t=first;
|
|
first=first->next;
|
|
free(t);
|
|
}
|
|
}
|
|
|
|
struct car* clear_train(struct car* first, const char* target)
|
|
{
|
|
struct car* t;
|
|
struct car* ptr;
|
|
|
|
if(first==NULL || target==NULL)
|
|
{
|
|
return first;
|
|
}
|
|
|
|
while(strcmp(first->value, target)==0)
|
|
{
|
|
t=first;
|
|
first=first->next;
|
|
free(t);
|
|
|
|
if(first==NULL)
|
|
{
|
|
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
|
|
ptr=first;
|
|
|
|
do
|
|
{
|
|
if(strcmp(ptr->next->value, target)==0)
|
|
{
|
|
t=ptr->next;;
|
|
ptr->next = ptr -> next->next;
|
|
free(t);
|
|
}
|
|
else
|
|
{
|
|
ptr = ptr -> next;
|
|
}
|
|
}while(ptr->next);
|
|
|
|
|
|
return first;
|
|
}
|
|
|