112 lines
3.1 KiB
Java
112 lines
3.1 KiB
Java
import java.util.Scanner;
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class Stack {
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private int maxSize;
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private int[] stackArray;
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private int top;
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public Stack(int size) {
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maxSize = size;
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stackArray = new int[maxSize];
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top = -1;
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}
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public void push(int value) {
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if (isFull()) {
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System.out.println("Stack is full");
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} else {
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top++;
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stackArray[top] = value;
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}
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}
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public int pop() {
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if (isEmpty()) {
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System.out.println("Stack is empty");
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return -1;
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} else {
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return stackArray[top--];
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}
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}
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public int peek() {
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if (isEmpty()) {
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System.out.println("Stack is empty");
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return -1;
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} else {
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return stackArray[top];
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}
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}
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public boolean isEmpty() {
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return (top == -1);
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}
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public boolean isFull() {
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return (top == maxSize - 1);
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}
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public static void main(String[] args) {
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Stack stack = new Stack(5);
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Scanner sc = new Scanner(System.in);
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int choice;
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do {
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System.out.println("\nStack Operations:");
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System.out.println("1. Push");
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System.out.println("2. Pop");
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System.out.println("3. Peek");
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System.out.println("4. Check if empty");
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System.out.println("5. Check if full");
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System.out.println("0. Exit");
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System.out.print("Enter your choice: ");
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choice = sc.nextInt();
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switch (choice) {
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case 1:
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System.out.print("Enter value to push: ");
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int value = sc.nextInt();
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if (stack.isFull()) {
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System.out.println(
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"Cannot push anymore. Stack is full."
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);
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} else {
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stack.push(value);
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}
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break;
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case 2:
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if (stack.isEmpty()) {
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System.out.println("Cannot pop. Stack is empty.");
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} else {
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int poppedValue = stack.pop();
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if (poppedValue != -1) {
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System.out.println("Popped value: " + poppedValue);
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}
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}
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break;
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case 3:
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int peekedValue = stack.peek();
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if (peekedValue != -1) {
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System.out.println("Top value: " + peekedValue);
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}
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break;
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case 4:
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System.out.println("Is stack empty? " + stack.isEmpty());
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break;
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case 5:
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System.out.println("Is stack full? " + stack.isFull());
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break;
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case 0:
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System.out.println("Exiting...");
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break;
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default:
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System.out.println("Invalid choice. Please try again.");
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}
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} while (choice != 0);
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sc.close();
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}
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}
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