C Program to implement STACK operations using Linked Lists

Data structures using C, Stack is a data structure in which the objects are arranged in a non linear order. In stack, elements are aded or deleted from only one end, i.e. top of the stack. In this program, we implement the stack operations using linked list. Read more about C Programming Language .

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#include <stdlib.h>
typedef struct node {
int data;
struct node *link;

void Push(int);
int pop();
void Display();
NODE *top = NULL; /* Global Declarations */

main() {
/* Main Program */
int opn, elem;
do {
printf("n ### Linked List Implementation of STACK Operations ### nn");
printf("n Press 1-Push, 2-Pop, 3-Display,4-Exitn");
printf("n Your option ? ");
scanf("%d", &opn);
switch (opn) {
case 1:
printf("nnRead the Element tobe pushed ?");
scanf("%d", &elem);
case 2:
elem = Pop();
if (elem != -1)
printf(" Deleted Node(From Top)with the Data: %dn", elem);
case 3:
printf("Linked List Implementation of Stack: Status:n");
case 4:
printf("nn Terminating nn");
printf("nnInvalid Option !!! Try Again !! nn");
printf("nnnn Press a Key to Continue . . . ");
} while (opn != 4);

void Push(int info) {
NODE *temp;
temp = (NODE *) malloc(sizeof(NODE));
if (temp == NULL)
printf(" Out of Memory !! Overflow !!!");
else {
temp->data = info;
temp->link = top;
top = temp;
printf(" Node has been inserted at Top(Front) Successfully !!");

int Pop() {
int info;
NODE *t;
if (top == NULL) {
printf(" Underflow!!!");
return -1;
} else {
t = top;
info = top->data;
top = top->link;
t->link = NULL;
return (info);

void Display() {
NODE *t;
if (top == NULL)
printf("Empty Stackn");
else {
t = top;
while (t) {
printf("[%d]->", t->data);
t = t->link;
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