gistfile1.txt

#include<stdio.h>
#include<malloc.h>
struct stack      
{
	int info;
	struct stack *next;
};
typedef struct stack *s;

void push(s sptr ,int p)
{
	
	s s2;
	s2=(s)malloc(sizeof(struct stack));
	if(s2==NULL)
	{
		printf("no memory");
		exit(1);
	}

	else
	{
		s2->info=p;
		s2->next=sptr;
		sptr=s2;
	}
}

void pop(s sptr)
{
	s s2=sptr;
	int px;
	if(sptr==NULL)
	{
		printf("stack is empty");
		exit(1);
	}
	else
	{
		px=sptr->info;
        sptr=sptr->next;
        free(sptr);
	}
}

void disp(s sptr)
{
    s temp=sptr;	
	printf("the elements in stack are:\n");
    while(sptr->next!=NULL)
	{
	    printf("%d\n",sptr->info);
	    sptr=sptr->next;
	}
	sptr=temp;
	
}




void main()
{
	int c,i;
    s s1=NULL;
   
   do{
	   printf("enter operation:-");
	   scanf("%d",&c);
	   switch(c)
	   {
	   case 1:  printf("enter data:-");
	             scanf("%d",&i);
	             push(s1,i);
				 break;
			   
	   case 2:pop(s1);break;
       case 3:disp(s1);  break;
	   }
   }while(s1!=NULL);
}