and this is part $4$ nothing works i need help pls$!$ in c# break; case Operation.Decimal: currentValue $+=$ secondValue $\frac{?}{10}$ : $//$ Assuming secondValue is a single digit break default: Console.WriteLine$("$Inyalid operation. $")$; break; $\})$ Console.WriteLine$($S$\text{'}$Result: $($currentValue$)")$; lastOperation $=0$; else $()$ Console.WriteLine$("$Invalid input for the second value$)$; $)$ If $($currentOperation $!=($int$)$Operation$.$ Equal$)\}$ lastOperation $=$ currentOperation;

break;

case Operation.Decimal:

currentValue t$=$ secondValue $/10$; $//$ Assuming secondValue is a single digit

break;

default:

Console. WriteLine$("$Invalid operation. $")$;

$\}$

break;

Console. WriteLine$($ $ "Result: $\{$currentValue$\}")$;

$\}$

lastoperation $={}_i$

else

i$.$

$3$

Console.Writeline $("$Invalid input for the second value."$)$;

$\}$