How to delete an array of pointers?

[Acabar]

Good day!

Offtopic:
I am a student. And I got really used to java. So when it comes to C++ homeworks, situation gets very tricky.

So here is the code:

#include <iostream>
//
// 
//
using namespace std;

struct test_ar {
    int *val;
    double *val2;
    test_ar() {
	val = NULL;
	val2 = NULL;
    }
    ~test_ar() {
	delete val;
	delete val2;
	cout << "test_ar destroyed" << endl;
    }
};

int
main(int argc, char** argv) {
    test_ar **test = new test_ar*[10];
    int x = 10;
    double y = 5.1;
    for (int c = 0; c < 5; c++) {
	test[c] = new test_ar;
	test[c]->val = &x;
	test[c]->val2 = &y;
    }
    for (int c = 5; c < 10; c++) {
	test[c] = NULL;
    }   
    delete[] test;
    
    return (EXIT_SUCCESS);
}

It works fine, but I need to get test_ar destructor working, when I delete an array of pointers to test_ar; When console starts, I don't see anything like test_ar destroyed; Am I doing something wrong?

Thanks, Andrey;

[jonnin]

you did it correctly. But you did not delete the memory properly. For this construct, youll need to loop over the inner pointers and delete them first (the actual objects).

so where you had it assigned to null in that second loop, instead use a delete command.

[Acabar]

I changed test[i] = NULL to [I]delete test; , but nothing happend.
But then I chenged the lest part of the code
delete[] test; into

    
for (int i = 0; i < 10; i++) {
	if (test[i] != NULL)
	    delete[] test[i];
    }

and I got this in the console:
test_ar destroyed
test_ar destroyed
test_ar destroyed
test_ar destroyed
test_ar destroyed
test_ar destroyed
test_ar destroyed
Segmentation fault (core dumped)
[Press Enter to close window]

after some debugging, I found out that
delete[] test[0]; instead of

    
for (int i = 0; i < 10; i++) {
	if (test[i] != NULL)
	    delete[] test[i];
    }

gives the same result.

Why I see test_ar destroyed 7 times instead of 5(or 1)? And how could I fix the
Segmentation fault (core dumped) message?

Maybe this could be helpful information:
I am using linux, and as IDE I use netbeans.

[blackettle76]

you did this?
:
...
for (int i = 0; i < 10; i++) {
if (test[i] != NULL)
delete test[i];
}
delete[] test;
...

test[i] is not an array so you can't use delete[] test[i]

[jonnin]

you repeatedly deleted the same node when you put it to [0] -- deletion does NOT set the value to null, it just gives the memory back to the OS. So.. you tried to delete memory you do not own (anymore) the second time in that loop.