Peek Top Element of Stack in DSA C - Build from Scratch

Peek Top Element of Stack

📖 Scenario: You are building a simple program to manage a stack of books. You want to be able to see the top book on the stack without removing it.

🎯 Goal: Create a stack using an array, set up a variable to track the top, write code to peek at the top element, and print it.

📋 What You'll Learn

Create an integer array called stack with exactly these values: 10, 20, 30, 40, 50

Create an integer variable called top and set it to 4

Create an integer variable called peek and set it to the top element of the stack using stack[top]

Print the value of peek using printf

💡 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 like peek is important for software development, debugging, and working with low-level programming.

1

Create the stack array

Create an integer array called stack with these exact values: 10, 20, 30, 40, 50

DSA C

# Create the stack array with values 10, 20, 30, 40, 50
// Your code here

Hint

Use int stack[5] = {10, 20, 30, 40, 50}; to create the array.

2

Set the top index

Create an integer variable called top and set it to 4 to represent the top index of the stack

DSA C

int stack[5] = {10, 20, 30, 40, 50};
// Create the top index variable and set it to 4
// Your code here

Hint

Use int top = 4; to set the top index.

3

Peek the top element

Create an integer variable called peek and set it to the top element of the stack using stack[top]

DSA C

int stack[5] = {10, 20, 30, 40, 50};
int top = 4;
// Create peek variable and assign stack[top]
// Your code here

Hint

Use int peek = stack[top]; to get the top element.

4

Print the peeked element

Print the value of peek using printf with the format specifier %d

DSA C

int stack[5] = {10, 20, 30, 40, 50};
int top = 4;
int peek = stack[top];
// Print the peeked value
// Your code here

Hint

Use printf("%d\n", peek); to print the top element.