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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. #ifndef HELLO_WORLD_STACK_H
  5. #define HELLO_WORLD_STACK_H
  6.  
  7.  
  8. class stack {
  9.  
  10. private:
  11.  
  12.     class elem {
  13.     public:
  14.         const int value;
  15.         elem* next;
  16.  
  17.         elem(const int, elem*);
  18.     };
  19.  
  20.     elem* topElem = nullptr;
  21.  
  22. public:
  23.     ~stack();
  24.     void push(const int);
  25.     void pop();
  26.     const int top();
  27.  
  28. };
  29.  
  30.  
  31. #endif //HELLO_WORLD_STACK_H
  32.  
  33. stack::elem::elem(const int v, elem* n): value(v), next(n) {}
  34.  
  35. stack::~stack() {
  36.     elem* currentElem = topElem;
  37.  
  38.     while (currentElem->next != nullptr) {
  39.         elem *toDelete = currentElem;
  40.         currentElem = currentElem->next;
  41.         delete toDelete;
  42.     }
  43.  
  44.     delete currentElem;
  45. }
  46.  
  47. void stack::push(const int i) {
  48.     topElem = new elem(i, topElem);
  49. }
  50.  
  51. void stack::pop() {
  52.     if (topElem != nullptr) {
  53.         elem* toDelete = topElem;
  54.         topElem = topElem->next;
  55.         delete toDelete;
  56.     } else {throw "empty stack";}
  57. }
  58.  
  59. const int stack::top() {
  60.     if (topElem != nullptr) {
  61.         return topElem->value;
  62.     }
  63.     throw "empty stack";
  64. }
  65.  
  66. int main() {
  67. 	// your code goes here
  68. 	return 0;
  69. }
Success #stdin #stdout 0s 5300KB
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https://ideone.com/e3ecJF
language:
C++ (gcc 8.3)
created:
13 days ago
visibility:
public

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