C/data_structures/linked_list/stack_using_linkedlists.c

#include<stdio.h>
#include<stdlib.h>
struct node
{
	int info;
	struct node *link;
};
struct node *top=NULL,*temp;
void  push(struct node*);
void pop(struct node*);
void display(struct node*);

int main()
{ 
 int x=0,item;  
 printf("\t****stack using linked list****\n");
	while(x!=4)
	{
		printf("enter your choice");
		printf("\n1.push\n2.pop\n3.display\n4.exit\n");
		scanf("%d",&x);
		switch(x)
		{
			case 1:
			     push(top);
			   break;
			case 2: pop(top);
		  break;
			case 3: display(top);
			      break;
			case 4: return 0;
			      
		}
	}
	
}

void push(struct node *p)
{
	int item;
	struct node *temp;
	temp=(struct node *)malloc(sizeof(struct node));
	printf("enter element to be inserted\n");
			scanf("%d",&item);
			temp->info=item;
			

    
			temp->link=top;
		top=temp;
		
	

	printf("inserted succesfully\n");
}
void pop(struct node *p)
{
	int item;
	struct node *temp;
	
		if(top==NULL)
	printf("stack is empty\n");
	  else{
	  	item=top->info;
	  	temp=top;
	  	top=top->link;
	  	free(temp);
	  	printf("Element popped is%d\n",item);
	  }
	
}


void display(struct node *p)
{
	
	if(top==NULL)
	printf("stack is empty\n");
	else
	{	printf("Elements in the stack are\n");
		while(p!=NULL)
		{
		printf("%d\n",p->info);
		p=p->link;
         }
        // printf("%d\n",p->info);
        
	}

}