Question

how to allocate an array on the heap and stack? Create a constructor and a destructor if it's needed.

Please provide example code in C++.

Answer 1

array allocation on stack is done when the array is declared with specified size in the program itself before compilation but not dynamically i.e if the compiler knows then it will allocate memory in stack. Otherwise the programmer can allocate dynamically or can force the memory allocation in heap by using "new" operator.

Example :-

#include <iostream>

using namespace std;
class example{
public:
int *arr_heap;
example(){
//allocation in heap memory
arr_heap = new int[10];
cout<<"heap allocation"<<endl;
}
~example(){
//de-allocation in heap memory
free(arr_heap);
cout<<"heap de-allocated"<<endl;
}
};

int main() {
int arr_stack[10]; //de-allocation in stack memory
example obj;
}