C Program to Implement a stack library (dystack.h) of integers using a dynamic (linked list) implementation of the stack | DS - IProgramX

Q. Implement a stack library (dystack.h) of integers using a dynamic (linked list) implementation of the stack and implementing the above five operations. Write a driver program that includes stack library and calls different stack operations.

Program

#include <stdio.h>
#include <stdlib.h>
#include "dystack.h"
int main()
{
    int n, ch;
    do
    {
        printf("\n\nStack Menu\n1. Push \n2. Pop\n3. Display\n0. Exit");
        printf("\nEnter Choice 0-3? : ");
        scanf("%d", &ch);
        switch (ch)
        {
            case 1:
                printf("\nEnter number ");
                scanf("%d", &n);
                push(n);
                break;
            case 2:
                pop();
                break;
            case 3:
                display();
                break;
        }
    }while (ch != 0);
}

Library Function ( .h file )
NOTE: save file name as ' dystack.h'.

struct node
{
    int data;
    struct node *next;
};

struct node *top = NULL;

void display();
void push(int);
void pop();
void push(int item)
{
    struct node *nptr = malloc(sizeof(struct node));
    nptr->data = item;
    nptr->next = top;
    top = nptr;
}

void display()
{
    struct node *temp;
    temp = top;
    while (temp != NULL)
    {
        printf("\n%d", temp->data);
        temp = temp->next;
    }
}

void pop()
{
    if (top == NULL)
    {
        printf("\n\nStack is empty ");
    }
    else
    {
        struct node *temp;
        temp = top;
        top = top->next;
        printf("\n\n%d deleted", temp->data);
        free(temp);
    }
}


Output:

Stack Menu
1. Push
2. Pop
3. Display
0. Exit
Enter Choice 0-3? : 1

Enter number 5


Stack Menu
1. Push
2. Pop
3. Display
0. Exit
Enter Choice 0-3? : 1

Enter number 7


Stack Menu
1. Push
2. Pop
3. Display
0. Exit
Enter Choice 0-3? : 1

Enter number 9


Stack Menu
1. Push
2. Pop
3. Display
0. Exit
Enter Choice 0-3? : 3

9
7
5

Stack Menu
1. Push
2. Pop
3. Display
0. Exit
Enter Choice 0-3? : 2


9 deleted

Stack Menu
1. Push
2. Pop
3. Display

0. Exit