My code is not taking any input even if im using ```cin.get(A,size);``` and its showing error while using ```getline(cin,A);```

Question

I'm using insert() function to take input in which I'm trying a different methods to take input but it's now working

Here is the full code. Can anyone please help me how to take an input string

#include <iostream>

using namespace std;

class _string{
private:
    char *A;
    int size;
public:
    _string(){
        size = 10;
        A = new char[size];
    }
    _string(int sz){
        size = sz;
        A = new char[size];
    }
    ~_string(){
        delete []A;
    }

    void insert();
    void view();


};

void _string::insert(){
    cout<<"enter string: ";
    cin.getline(A,size);
}
void _string::view(){
    puts(A);
}

int main()
{
    _string *arr;
    int n;
    cout<<"Enter the size of string: "; cin>>n;

    arr = new _string(n);

    arr->insert();
    arr->view();
    
    return 0;
}

But when I'm using c function scanf("%s[^\n],A); its working ....

so please tell me how to use fgets(),getline(),cin.get() in my code