public void OperationButtonPress(string valueBtnOperation)
{
if (vmCalculation.FirstOperand == string.Empty || LastOperation == "=")
{
vmCalculation.FirstOperand = display;
LastOperation = valueBtnOperation;
}
else
{
vmCalculation.SecondOperand = display;
vmCalculation.Operation = lastOperation;
vmCalculation.Calculation(vmCalculation.FirstOperand, vmCalculation.Operation, vmCalculation.SecondOperand);
if (vmCalculation.SecondOperand != "0" && vmCalculation.Operation != "/")
{
FullExpression = vmCalculation.FirstOperand + " " + vmCalculation.Operation + " " + vmCalculation.SecondOperand + " " + "=" + vmCalculation.Result;
}
else
{
FullExpression = "Ділення на нуль";
}
LastOperation = valueBtnOperation;
Display = vmCalculation.Result;
vmCalculation.FirstOperand = display;
}
newDisplayRequired = true;
}
