public void ChangeSignOfOperand()
{
StringManager stringManager = new StringManager();
stringManager.AddDigitToOperand("1");
stringManager.ChangeSignOfOperand();
Assert.AreEqual("-1", stringManager.FirstOperand.ToString());
StringManager stringManager2 = new StringManager();
stringManager2.AddDigitToOperand("-5");
stringManager2.ChangeSignOfOperand();
Assert.AreEqual("5", stringManager2.FirstOperand.ToString());
}
private void ChangeSignOfNumber(object sender, EventArgs e)
{
obslugaStringow.ChangeSignOfOperand();
disp.Text = obslugaStringow.DisplayOperand();
}
