Stack Implementation in C

In this tutorial, we are going to see how to implement a stack in C using an array. It involves various operations such as push, pop, etc.

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Stack Implementation in C

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
 
#define size 5

struct stack
{
    int arr[size];
    int top;
};
typedef struct stack STACK;
STACK s;

void push(int item) {
  if (s.top >= size - 1)
    return;
  s.top++;
  s.arr[s.top] = item;
}

int pop() {
  if (s.top == -1)
    return 1;
   int item;
   item = s.arr[s.top];
   s.top--;
   return item;
}

void afficher() {
   int i;
   if (s.top == -1)
      printf("\nThe stack is empty!");
   else {
      for (i = s.top; i >= 0; i--)
         printf("\n%d", s.arr[i]);
   }
}

int main() {
   int item, choice;
   int option = 1;
   s.top = -1;
 
   printf("\n\tStack implementation");
   while (option) {
      printf("\nMain menu");
      printf("\n1.Stack \n2.Unstack \n3.Print \n4.Exit");
      printf("\nEnter your choice: ");
      scanf("%d", &choice);
      switch (choice) {
      case 1:
         printf("\nEnter The element to be stacked: ");
         scanf("%d", &item);
         push(item);
         break;
      case 2:
         item = pop();
         printf("\nThe unstacked element is%d", item);
         break;
      case 3:
         afficher();
         break;
      case 4:
         exit(0);
      }
      printf("\nDo you want to continue (Type 0(No) or 1(Yes))? : ");
      scanf("%d", &option);
   }
   return 0;
}

Output:

        Stack implementation
Main menu
1.Stack 
2.Unstack 
3.Print 
4.Exit
Enter your choice: 1

Enter The element to be stacked: 50

Do you want to continue (Type 0(No) or 1(Yes))? : 1

Main menu
1.Stack 
2.Unstack 
3.Print 
4.Exit
Enter your choice: 3

50

 
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