private void buttonCompute_Click(object sender, EventArgs e)
{
var expression = textInput.Text;
var result = ArithmeticExpression.ComputeResult(expression);
textOutput.Text = result.ToString();
}
private void listViewHistory_Click(object sender, EventArgs e)
{
var lastIndex = listViewHistory.SelectedIndices.Count - 1;
var index = listViewHistory.SelectedIndices[lastIndex];
if (index == 0)
{
return;
}
var expressions = listViewHistory.Items.Cast <ListViewItem>().Select(item => item.Text).ToList();
var result = ArithmeticExpression.AddResults(expressions, index);
textOutput.Text = result.ToString();
}