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  1.  
  2. class Stack {
  3. // size of the stack
  4. 	static final int MAX = 1000;
  5. 	int top;
  6. 	int a[] = new int[MAX]; // Maximum size of Stack
  7.  
  8.    //check if the stack is empty if top is -1 then stack is empty else not
  9. 	boolean isEmpty()
  10. 	{
  11. 		return (top < 0);
  12. 	}
  13.    // constructor for the Stack Class
  14. 	Stack()
  15. 	{
  16. 		top = -1;
  17. 	}
  18.  
  19.  
  20. 	boolean push(int x)
  21. 	{
  22.         // if stack is already full 
  23. 		if (top >= (MAX - 1)) {
  24. 			System.out.println("Stack Overflow");
  25. 			return false;
  26. 		}
  27. 		else {
  28. 			a[++top] = x;
  29. 			System.out.println(x + " pushed into stack");
  30. 			return true;
  31. 		}
  32. 	}
  33.  
  34. 	int pop()
  35. 	{
  36.         // if stack is empty 
  37. 		if (top < 0) {
  38. 			System.out.println("Stack Underflow");
  39. 			return 0;
  40. 		}
  41. 		else {
  42. 			int x = a[top--];
  43. 			return x;
  44. 		}
  45. 	}
  46.  
  47. 	int peek()
  48. 	{
  49.         // if stack is empty
  50. 		if (top < 0) {
  51. 			System.out.println("Stack Underflow");
  52. 			return 0;
  53. 		}
  54. 		else {
  55. 			int x = a[top];
  56. 			return x;
  57. 		}
  58. 	}
  59. }
  60.  
  61. // Driver code
  62. class Main {
  63. 	public static void main(String args[])
  64. 	{
  65. 		Stack s = new Stack();
  66. 		s.push(10);
  67. 		s.push(20);
  68. 		s.push(30);
  69. 		System.out.println("top element of the stack is " + s.peek());
  70. 		System.out.println(s.pop() + " Popped from stack");
  71. 	    System.out.println("top element of the stack is " + s.peek());
  72. 	}
  73. }
  74.  
Success #stdin #stdout 0.14s 35868KB
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Standard input is empty
stdout
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10 pushed into stack
20 pushed into stack
30 pushed into stack
top element of the stack is 30
30 Popped from stack
top element of the stack is 20
https://ideone.com/VGDQNA
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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