I need help. I want to print data in list in c++. First i inserted some information into the list and don't know to print them

Question

class List1{
public:
Park info;
List1* next;
};

List1* last = NULL;
List1* head = NULL;
List1* potr = NULL;

for(int i =0; i<3; i++){
if(head==0){
cout<<"Ro'yxat bo'sh"<<endl;
continue;

}
cout<<"******Ro'yxat*******"<<endl<<endl;
potr[i] = head[i];
while(1){
cout<<potr[i].info<<endl;
if(potr[i].next ==0) break;

potr[i] = potr[i].next;
}
cout<<endl;
continue;
}

Here 'potr[i] = potr[i].next' is giving an error. What should I do?

Answer 1

Where is definition of `Park` in class `List1`?

Park info; // <-- Undefined Park

Answer 2

Fayzullo Abduhakimov
You need to save your code in SoloLearn first. Then share just the saved code link here. That way you don't have to worry your code get truncated because it's too big. Just follow the below guide 👇

https://www.sololearn.com/post/75089/?ref=app

Answer 3

Ok thanks 😊 for attention

Answer 4

Try potr[i]->next

The dot is used to acces a member of a structure.
The arrow is used to access a member of a structure through a pointer to that structure.

if potr[i] is a pointer to a structure you have to use the arrow

Answer 5

https://code.sololearn.com/cpQE1cFMoxb9/?ref=app

Answer 6

It's from data-structures. I mustn't use 'list'

Answer 7

#include <iostream>
#include <sstream>
using namespace std;

class Park {
public:
int nomeri;
string FIO;
int yonalish_nomeri;
string Strings;

void kirit(int number, string FIO, int yo_nomer){
this->nomeri = number;
this->FIO = FIO;
this->yonalish_nomeri = yo_nomer;
}

void chiqar(){
cout<<"Nomeri: "<<nomeri<<endl;
cout<<"FIO: "<<FIO<<endl;
cout<<"Yo'nalish nomeri': "<<yonalish_nomeri<<endl;
}

operator const char*(){
ostringstream formatting;
formatting<<nomeri<<endl;
formatting<<FIO<<endl;
formatting<<yonalish_nomeri<<endl;
Strings = formatting.str();
return Strings.c_str();

}

};

class List1{
public:
Park info;
List1* next;
};

class List2{
public:
Park info;
List2* next;

};

List1* lst=NULL;
List1* last = NULL;
List1* head = NULL;
List1* potr = NULL;

int main(){

Park car[3];
car[0].kirit(321,"Abdullayev Abdulla", 56);
car[1].kirit(743,"Sobirov Jamshid", 87);
c

Answer 8

int main(){

Park car[3];
car[0].kirit(321,"Abdullayev Abdulla", 56);
car[1].kirit(743,"Sobirov Jamshid", 87);
car[2].kirit(823,"Nosirov Elyor", 70);

List1* p = new List1[3];

for(int i=0; i<3; i++){
p[i].info = car[i];
p[i].next = NULL;

if(lst==NULL){
*lst = p[i];
*last = p[i];
}
else{
last->next = &p[i];
last = &p[i];
}

}

for(int i =0; i<3; i++){
if(head==0){
cout<<"Ro'yxat bo'sh"<<endl;
continue;

}

Answer 9

I couldn't send full code at once

Answer 10

Words were limited

Answer 11

Ok. Can anybody help me solve this problem?

Answer 12

Fayzullo Abduhakimov as Ipang said, you need to share your code properly. Like that
https://code.sololearn.com/csruO5TPQa14/?ref=app

Just copy/paste your code in the playground and then share it with the '+" button that you can see while writing a comment. You'll find your code in your code bits

Answer 13

I think i managed to send the code. And now please help what to do

Answer 14

I should insert all data into the linear list and then print them all.

Answer 15

And also give advice how to remove a data in the list if possible

Answer 16

I need help!

Answer 17

in line 90
potr[i] = potr[i]->next;
Since potr[i] is not a pointer, it was right to use the dot instead of the arrow.
However potr[i].next is a pointer and you can't assign it to potr[i]

I have no idea of what the program does.
If your intentions were to assign to potr[i] what is pointed by potr[i].next, you can do it in this way:
potr[i] = *(potr[i].next);

If you wanted to change the address of potr[i] with that stored in potr[i].next, you can't do it because since potr is an array, it is a constant pointer

Answer 18

Create a program that consists of dynamic information about the bus in the bus fleet.

Information about each bus includes:

- bus number (number);

- The driver's name;

- direction number;

The program should provide the following:

- provide preliminary information about all buses in the fleet in the form of a list;

- When each bus leaves the fleet, its number is entered and the information about it is removed from the list of buses in the fleet and added to the list of buses on the route;

https://code.sololearn.com/cpQE1cFMoxb9/?ref=app

Answer 19

I tried to solve this problem.

Answer 20

I don't know wait for the answer of someone more familiar with c++.