基於C ++數組的堆棧實現拋出錯誤

Question

我是C ++的新手，所以這必須是微不足道的。 我使用數組實現了一個堆棧，但似乎無法從main調用。 這是我的主要（）。

#include <iostream>
#include <cstdlib>
#include "stack.cpp"

int main(){

  myStack = new Stack(10);
  return 0;
}

這是我的.hpp

#include <string>

class Stack {

public:
      Stack(int capacity);

      void push(int value);

      int peek();
      void pop();
      bool isEmpty();

      ~Stack() {
            delete[] storage;
      }

private:
        int top;
        int capacity;
        int *storage;
};

這是我的.cpp

#include "stack.hpp"


Stack::Stack(int capacity) {
      if (capacity <= 0)
            throw std::string("Stack's capacity must be positive");
      storage = new int[capacity];
      this->capacity = capacity;
      top = -1;
}

void Stack::push(int value) {
      if (top == capacity)
            throw std::string("Stack's underlying storage is overflow");
      top++;
      storage[top] = value;
}

int Stack::peek() {
      if (top == -1)
            throw std::string("Stack is empty");
      return storage[top];
}

void Stack::pop() {
      if (top == -1)
            throw std::string("Stack is empty");
      top--;
}

bool Stack::isEmpty() {
      return (top == -1);
}

這是錯誤消息。

client.cpp: In function ‘int main()’:
client.cpp:7:3: error: ‘myStack’ was not declared in this scope
   myStack = new Stack(10);
   ^

不知道我錯過了什么。

Answer 1

Stack* myStack = new Stack(10);
...
delete myStack;

或者在堆棧上聲明myStack

Stack myStack(10);

另請查看std :: unqiue_ptr，這樣您就不必編寫刪除myStack了。