Strange errors

**jw232** · 04-19-2008

When I run it, half the time I get "exception: bad allocation", and in the other half I get six 3's but the last is a garbage value. Does anyone know why? I'm using Visual C++ 2008. It works fine when size is less than 7.

Code:

void print_array(ostream& os, int* a, int n)
{
	for (int i = 0; i < n; i++) {
		cout << a[i] << "\n";
	}
}

int main()
try {
	const int size = 7;

	int* p2 = new int(size);
	for (int i = 0; i < size; i++) {
		p2[i] = 3;
	}

	print_array(cout, p2, size);

	cin.get();
	return 0;
}
catch(exception& e) {
	cerr << "exception: " << e.what() << '\n';
	keep_window_open("q");
	return 1;
}
catch (...) {
	cerr << "Some exception\n";
	keep_window_open("q");
	return 2;
}

**laserlight** · 04-19-2008

Code:

int* p2 = new int(size);

p2 points to a single int with a value of size. You want to use new[] instead, and remember to have a corresponding delete[]... but of course in this case you might as well use std::tr1::array or a raw array since size is const. If not, you should just use std::vector.

**Elysia** · 04-20-2008

Code:

int* p2 = new int(size);
delete p2; // Delete me!

Create one int and initialize it with the value of size.

Code:

int* p2 = new int[size];
delete [] p2; // Delete me!

Create size ints

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