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Interactive C program to implement stack using doubly linked list


shiv@ubuntu:~/ds/stack$ cat stack.c
/*
 * Copy right by Shiv Yaragatti
 * you are free to use, modify  and redistribute code on own risk
 * Interactive C Program to implement STACK using Doubly linked list
 */

#include "header.h"

struct stack {
int data;
struct stack *next;
struct stack *prev;

};

typedef struct stack *S;
/*Push elements in to stack */
void push(S *stack)
{
  int e;
  S temp;
  temp=malloc(sizeof(struct stack));
  if(!temp){
     printf("Can't allocate memory\n");
     return;
 }
 printf("Enter element to push\n");
 scanf("%d", &e);

 temp->data=e;
 if(*stack == NULL){
    temp->next = temp->prev = NULL;
    *stack=temp;
 } else {
   temp->next = *stack;
   (*stack)->prev = temp;
   temp->prev = NULL;
   *stack=temp;
 }

}
/* Display elements in the stack */
void display(S s){
   S temp;

   temp=s;
   printf("Elements are ...\n");
   while(temp) {
    printf("%d\n", temp->data);
    temp=temp->next;
   }

}
/* Pop out elements in stack */
void pop(S *stack)
{
  S del;
  if(*stack == NULL){
     printf("Stack is Empty ..\n");
     return;
  }
  printf("Deleted .. %d\n", (*stack)->data);
  del = *stack;
  *stack = (*stack)->next;
  /* free memory once poped */
  free(del);
  if((*stack)){
     (*stack)->prev = NULL;
  }

}

/* main program that help you to simulate stack operations*/
int main()
{

int ch;
S s=NULL;
while(1){
system("clear");
printf("1 Push\n2 Pop\n3 Display\n4 exit\n");
printf("Enter you choice\n");
scanf("%d", &ch);

 switch(ch) {
    case 1: push(&s); break;
    case 2: pop(&s); break;
    case 3: display(s); break;
    case 4: exit(0);
    default: printf("invalid choice\n");
 }
getchar();
getchar();
}
return 0;
}
/* end of the program */
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