Pop Operation on Stack in DSA C - Build from Scratch

Pop Operation on Stack

📖 Scenario: Imagine you have a stack of books. You can only take the top book off the stack. This project will help you understand how to remove (pop) the top item from a stack using C programming.

🎯 Goal: You will build a simple stack with 3 items and then remove the top item using the pop operation. Finally, you will print the stack after popping to see the result.

📋 What You'll Learn

Create an integer array called stack with exactly these values: 10, 20, 30

Create an integer variable called top and set it to 2 (index of the last item)

Write code to pop the top item from the stack by decreasing top by 1

Print the stack elements from index 0 to top inclusive

💡 Why This Matters

🌍 Real World

Stacks are used in many places like undo features in apps, browser history, and managing function calls.

💼 Career

Understanding stack operations is important for software developers, especially when working with algorithms, memory management, and system programming.

1

Create the stack array

Create an integer array called stack with exactly these values: 10, 20, 30

DSA C

# Create the stack array with values 10, 20, 30
// Your code here

Hint

Use curly braces to list the values inside the array.

2

Set the top index

Create an integer variable called top and set it to 2 (the index of the last item in the stack)

DSA C

int stack[3] = {10, 20, 30};
// Create the top variable and set it to 2
// Your code here

Hint

The top variable tells us where the last item is in the stack.

3

Pop the top item

Decrease the value of top by 1 to pop the top item from the stack

DSA C

int stack[3] = {10, 20, 30};
int top = 2;
// Pop the top item by decreasing top
// Your code here

Hint

Subtract 1 from top to remove the last item.

4

Print the stack after pop

Use a for loop with variable i from 0 to top inclusive to print each element of stack separated by spaces

DSA C

int stack[3] = {10, 20, 30};
int top = 2;
top = top - 1;
// Print stack elements from index 0 to top
// Your code here

Hint

Use printf inside the loop to print each element followed by a space.