I'm kinda new to C++, so this must be something trivial. I've implemented a stack using an array but can't seem to call from main. Here's my main( ).
#include <iostream>
#include <cstdlib>
#include "stack.cpp"
int main(){
myStack = new Stack(10);
return 0;
}
Here's my .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;
};
And here's my .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);
}
This is the error message.
client.cpp: In function ‘int main()’:
client.cpp:7:3: error: ‘myStack’ was not declared in this scope
myStack = new Stack(10);
^
Wonder what am I missing.
Stack* myStack = new Stack(10);
...
delete myStack;
Alternatively declare myStack on the stack
Stack myStack(10);
Also look into std::unqiue_ptr so you don't have to write delete myStack.
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