78 lines
1.5 KiB
Dart
78 lines
1.5 KiB
Dart
/**
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* File: array_stack.dart
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* Created Time: 2023-03-28
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* Author: liuyuxin (gvenusleo@gmail.com)
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*/
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/* Stack class based on array */
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class ArrayStack {
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late List<int> _stack;
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ArrayStack() {
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_stack = [];
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}
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/* Get the length of the stack */
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int size() {
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return _stack.length;
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}
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/* Determine if the stack is empty */
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bool isEmpty() {
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return _stack.isEmpty;
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}
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/* Push */
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void push(int _num) {
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_stack.add(_num);
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}
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/* Pop */
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int pop() {
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if (isEmpty()) {
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throw Exception("Stack is empty");
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}
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return _stack.removeLast();
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}
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/* Access stack top element */
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int peek() {
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if (isEmpty()) {
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throw Exception("Stack is empty");
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}
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return _stack.last;
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}
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/* Convert the stack to Array and return */
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List<int> toArray() => _stack;
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}
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/* Driver Code */
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void main() {
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/* Initialize stack */
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final ArrayStack stack = ArrayStack();
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/* Element push */
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stack.push(1);
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stack.push(3);
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stack.push(2);
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stack.push(5);
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stack.push(4);
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print("Stack stack = ${stack.toArray()}");
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/* Access stack top element */
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final int peek = stack.peek();
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print("Top element of the stack peek = $peek");
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/* Element pop */
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final int pop = stack.pop();
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print("Pop element pop = $pop, stack after pop = ${stack.toArray()}");
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/* Get the length of the stack */
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final int size = stack.size();
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print("Stack length size = $size");
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/* Determine if it's empty */
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final bool isEmpty = stack.isEmpty();
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print("Is the stack empty = $isEmpty");
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}
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