What is the level of usability of visual studio 10 express

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C++

Visual-Studio

Hello,
recently I have downloaded Visual Studio 10 Express C++,
registered it and started using it.
I have made simple windows form app,
with one button and two textBox controls for showing result.
On button click event, program should runt trough a simple
for..next loop and measure the time of execution.
Results are shown in textBox1 and textBox2 controls.

An important part of program code :

private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e)
{
Stopwatch clock;

clock.Start();

int i = 0;
double k = 0;
for (i=0; i<100; i=i+1)
{
k = k + 0.1;
}

clock.Stop();

textBox1->Text = (clock.Elapsed.TotalSeconds).ToString();

textBox2->Text = k.ToString();
}

The problem is that result of successive incrementing of value
of variable k inside looop is incorrect :

k = 9,99999999999998 instead k = 10.

Is this because the version of Visual Studio 10 is EXPRESS
and intended for evaluation only.

What I have tried:

I have read manual for C++, to see if I have made this program code wrong logically, and perhaps because of that error it gives wrong result, and I have found no error inside the code.