Stack

#include <stdio.h>

#include <iostream>
// 9_lab.cpp: определяет точку входа для консольного приложения.
//
#include <string.h>

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

int const len_table = 4;
struct sea
{
    char name[64];
    int deep;
    char location[64];
    sea *last;
    sea *head;
};
sea read()
{
    sea buf_elem;
    char name[32];
    char location[32];
    cin >> name >> buf_elem.deep >> location ;
    strcpy(buf_elem.name, name);
    strcpy(buf_elem.location,location);
    return buf_elem;
}
void show(sea seee, char sign = ' ')
{
    if (sign != ' ')
    {
        cout <<
            sign <<
            seee.name << setw(10) << sign <<
            seee.deep << setw(10) << sign <<
            seee.location << setw(10) << sign <<
            endl;
    }
    else {

        cout <<
            sign <<
            seee.name << sign <<
            seee.deep << sign <<
            seee.location << sign <<
            endl;
    }
}
void add(sea *stack, sea elem)
{
    sea *buf = new sea;
    strcpy(buf->name, elem.name);
    buf->deep = elem.deep;
    strcpy(buf->location ,elem.location);


    buf->last = stack->head;    //тот элемент, который является головным, сейчас перемещается в предыдущий для текущего
    stack->head = buf;          // текущий элемент становится головным
}
void delete_head_elem(sea *stack)
{
    if (stack->head != NULL)
    {

        sea *ptr = stack->head->last;
        delete stack->head;
        stack->head = ptr;
    }
    else
    {
        delete stack->head;
    }
}
void clear_all_steck(sea *stack) {
    while (stack->head != NULL)
    {
        delete_head_elem(stack);
    }
    delete stack->head;
    delete stack;
}
void tr(sea *stack)
{
    show(*stack->head);
    delete_head_elem(stack);
}

int main()
{
    sea seas[len_table];

    for (int i = 0; i < len_table; i++)
    {
        seas[i] = read();
    }

    for (int i = len_table - 1; i >= 0; i--)
    {
        cout << "+--------------------+--------------------+--------------------+\n";
        show(seas[i], '|');
    }
    cout << "+--------------------+--------------------+--------------------+\n";


    sea *stack = new sea;
    stack->head = NULL;
    stack->last = NULL;
    for (int i = 0; i < len_table; i++)
    {
        add(stack, seas[i]);
    }
    char answer[16];
    cout << "Do you want to take head elements in stack? Enter \"no\" or \"yes\".\n";
    while (true) {
        cin >> answer;
        if (strcmp(answer, "no") != 0 & strcmp(answer, "yes") != 0)
        {
            cout << "Error. Enter again.\n";

        }
        else
        {
            if (strcmp(answer, "yes") == 0)
            {
                if (stack->head != NULL)
                {
                    tr(stack);
                    cout << "Do you want to take head elements in stack again ? Enter \"no\" or \"yes\".\n";
                }
                else
                {
                    cout << "You can't take head element because stack is empty\n";
                    break;
                }
            }
            if (strcmp(answer, "no") == 0) {
                break;
            }
        }
    }
    clear_all_steck(stack);
    return 0;
}