Some problems in my scientific calculator

Question

Hey friends, I'm trying in this days to build a special application for iphone device.
In this application 1 part is a scientific calculator. I have some problems with the
trigo function and some other, i really dont know why.. For example, this code:
-(IBAction)buttomOperationPressed:(id)sender
    if (currentOperation==0) result=currentNumber;
    else
        switch (currentOperation) {
            case 1:
                result=result+currentNumber;
                break;
            case 2:
                result=result-currentNumber;
                break;
            case 3:
                result=result*currentNumber;
                break;
            case 4:
                result=result/currentNumber;
                break;
            case 5:
                result=currentNumber*currentNumber;
                break;
            case 6:
                switch (currentOperation) {
                    case 7:
                        result=asinhf(currentNumber);
                        break;
                    case 8:
                        result=acoshf(currentNumber);
                        break;
                    case 9:
                        result=atanhf(currentNumber);
                        break;
                break;
            case 7:
                result=asinf(currentNumber);
                break;
            case 8:
                result=asinf(currentNumber);
                break;
            case 9:
                result=asinf(currentNumber);
                break;
            case 10:
                result=currentNumber*(-1);
                break;
            case 11:
                //Shoresh
                break;
            case 12:
                currentOperation=0;
                break;
    currentNumber=0;
    caculatorScreen.text = [NSString stringWithFormat:@"%2f",result];
    if ([sender tag] == 0) result=0;
    currentOperation = [sender tag];
case 6 means the button "shift" in the caculator, alot of this actions does not work..
I did every think ok.. Please thanks for the helpers!

Answer 1

Since I don't know how your buttons work, I really can't say.
If shift is a separate button, you need to save its state, and when the next button is pressed run one of two switch/case depending on the state of the shift.