Push Operation on Stack in DSA C - Build from Scratch

Push Operation on Stack

📖 Scenario: Imagine you have a stack of plates. You can only add a new plate on top. This is called a push operation in a stack data structure.

🎯 Goal: You will create a simple stack using an array and write code to push (add) an element onto the stack.

📋 What You'll Learn

Create an integer array called stack with size 5

Create an integer variable called top and set it to -1

Write a function called push that takes an integer parameter value and adds it to the stack if there is space

Print the stack elements after pushing values

💡 Why This Matters

🌍 Real World

Stacks are used in undo features in apps, browser history, and expression evaluation.

💼 Career

Understanding stack operations is essential for software development and technical interviews.

1

Create the stack array and top variable

Create an integer array called stack with size 5 and an integer variable called top set to -1.

DSA C

int stack[5];
int top = -1;
// Your code here

Hint

Use int stack[5]; to create the array and int top = -1; to track the top position.

2

Create the push function

Write a function called push that takes an integer parameter value. Inside the function, check if top is less than 4. If yes, increase top by 1 and assign value to stack[top].

DSA C

int stack[5];
int top = -1;

// Write push function below
// Your code here

Hint

Remember to check if the stack is full before pushing.

3

Push values onto the stack

Call the push function three times with values 10, 20, and 30.

DSA C

int stack[5];
int top = -1;

void push(int value) {
    if (top < 4) {
        top++;
        stack[top] = value;
    }
}

// Call push function with 10, 20, 30
// Your code here

Hint

Call push three times with the given values.

4

Print the stack elements

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

DSA C

int stack[5];
int top = -1;

void push(int value) {
    if (top < 4) {
        top++;
        stack[top] = value;
    }
}

int main() {
    push(10);
    push(20);
    push(30);
    
    // Print stack elements
    // Your code here
    return 0;
}

Hint

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