Arrays in Constructors

[theChameleon]

Hello, i'd like to write something that fixes the size of an array inside a constructor, instead of fixing the size when declaring the array.

how do i do that?

i have tried...

class aClass{
        int size;
        int arr[];
    public:
        aClass();
};

aClass::aClass(){
    size = 10;
    arr[size];
    for(int i = 0; i < size; i++){
        arr[i] = 0; //initialise
    }

}

something like that, but, after running the main prog, a window will pop up telling me that theres an unhandled runtime exception.

is there a way to do wat i did, but get rid of this runtime exception thingie? thanks.

do i have to catch/throw some exception, and if so, what exception and how? im pretty new to this lang, so any help would be much appreciated.

[z05DSL3A]

You could do somthing like this:

#include <iostream>

class aClass{
        int size;
        int *arr;
    public:
        aClass();
        ~aClass();
};

aClass::aClass()
{
    size = 10;
    arr = new int[size];
    for(int i = 0; i < size; i++)
    {
        arr[i] = 0; //initialise
    }
}

aClass::~aClass()
{
   delete[] arr;    
}

int main() 
{
    aClass test;
}

But you would be better off using a vector

[Zaita]

"do i have to catch/throw some exception, and if so, what exception and how? im pretty new to this lang, so any help would be much appreciated."

try {

} catch (exception &ex) {
 cout << ex.what() << endl;
}

[theChameleon]

thanks Grey Wolf, for your prompt reply. that really helped in getting rid of that exception thingie.

a vector is not required, in my case, coz the number is fixed and not dynamic, but thanks anyway.