Here, I am present the stack through linked list
- stack linked-list
#include<stdio.h>
#include<stdlib.h>
int count=0;
struct node
{
int data;
struct node *next;
}*first=NULL,*temp=NULL,*newnode=NULL,*t=NULL;
struct node* createnode()
{
int x;
temp=(struct node*)malloc(sizeof(struct node));
printf("\nEnter value:");
scanf("%d",&x);
if(temp!=NULL)
{
temp->data=x;
temp->next=NULL;
return temp;
}
else
{
printf("\nMemory not allocated");
return 0;
}
}
void display()
{
if(first!=NULL)
{
for(temp=first;temp->next!=NULL;temp=temp->next)
printf("%d->",temp->data);
printf("%d->NULL",temp->data);
}
else
printf("\nstack is empty");
}
void push()
{
newnode=createnode();
count++;
if(first==NULL)
{
first=newnode;
}
else
{
for(temp=first;temp->next!=NULL;temp=temp->next);
temp->next=newnode;
newnode->next=NULL;
}
display();
}
void pop()
{
if(first==NULL)
printf("\nUNDERFLOW");
else
{
for(temp=first;temp->next!=NULL;temp=temp->next);
t=temp->next;
temp->next=NULL;
free(t);
count--;
}
display();
}
void peep()
{
int m,i=1;
printf("\nEnter position to peep");
scanf("%d",&m);
if(m>count)
printf("\nEnter valid position");
else
{
for(temp=first;i<=count-m;i++,temp=temp->next);
printf("\nValue=%d",temp->data);
}
}
main()
{
int choice;
while(1)
{
printf("\nMENU\n1.PUSH\n2.POP\n3.PEEP\n4.DISPLAY\n5.EXIT");
printf("\nEnter choice:");
scanf("%d",&choice);
switch(choice)
{
case 1:
push();
break;
case 2:
pop();
break;
case 3:
peep();
break;
case 4:
display();
break;
case 5:
exit(0);
default :
printf("\nEnter valid choice.");
}
}
}
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