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Sunday, January 29, 2012

C PROGRAM TO IMPLEMENT STACK AS LINKED LIST


ALGORITHM TO IMPLEMENT STACK AS LINKED LIST

PUSH( )
1.  t = newnode( )
2.  Enter info to be  inserted
3.  Read n
4.  t info = n
5.  t next = top
6.  top = t
7.  Return

POP( )
1.  If (top = NULL)
     Print “ underflow”
     Return
2.  x = top
3.  top = top   next
4.  delnode(x)
5.  Return




//  stack using linked list//
#include<stdio.h>
#include<conio.h>
struct stack
{
int no;
struct stack *next;
}
*start=NULL;
typedef struct stack st;
void push();
int pop();
void display();
void main()
{
char ch;
int choice,item;
do
{
clrscr();
printf("\n 1: push");
printf("\n 2: pop");
printf("\n 3: display");
printf("\n Enter your choice");
scanf("%d",&choice);
switch (choice)
{
case 1: push();


break;
case 2: item=pop();
printf("The delete element in %d",item);
break;
case 3: display();
break;
default : printf("\n Wrong choice");
};
printf("\n do you want to continue(Y/N)");
fflush(stdin);
scanf("%c",&ch);
}
while (ch=='Y'||ch=='y');
}
void push()
{
st *node;
node=(st *)malloc(sizeof(st));
printf("\n Enter the number to be insert");
scanf("%d",&node->no);
node->next=start;
start=node;
}
int pop()
{
st *temp;
temp=start;
if(start==NULL)
{
printf("stack is already empty");
getch();
exit();
}
else
{
start=start->next;
free(temp);
}
return(temp->no);
}
void display()
{
st *temp;
temp=start;
while(temp->next!=NULL)
{
printf("\nno=%d",temp->no);
temp=temp->next;
}
printf("\nno=%d",temp->no);

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