#include<stdio.h>
#include<malloc.h>
struct node
{
int data;
struct node *link;
};
struct node * top= NULL; //Initially stack is empty
void push()
{
struct node*temp;
temp=(struct node *)malloc(sizeof(struct node));
printf("Enter a value");
scanf("%d",&temp->data);
temp->link=top;
top=temp;
}
void pop()
{
if(top==NULL)
{
printf("Stack underflow");
}
else
{
struct node*temp=top;
top=top->link;
printf("poped value=%d",temp->data);
free(temp);
}
}
void display()
{
struct node *temp=top;
if(top==NULL)
{
printf("Empty stack");
}
else
{
while(temp!=NULL)
{
printf("%d",temp->data);
temp=temp->link;
}
}
}
int main()
{
while(1)
{
printf("enter 1 for push\n");
printf("enter 2 for pop\n");
printf("enter 3 for display\n");
printf("enter 4 for exit");
int choice;
scanf("%d",&choice);
switch(choice)
{
case 1:
push();
break;
case 2:
pop();
break;
case 3:
display();
break;
case 4:
printf("end of the program");
break;
default:
printf("wrong choice\n");
}
if (choice==4)
break;
}
}
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