Using a property as a count in Objective C - objective-c

Question

I am new to Objective C. I was following Stanford lectures 2011-12 fall on iOS development and in assignment 1 it asks to implement a decimal point in a calculator. This is what my implementation looks like:
#import "CalculatorViewController.h"
#import "CalculatorBrain.h"
#interface CalculatorViewController()
#property (nonatomic) BOOL userIsInTheMiddleOfEnteringNumber;
#property (nonatomic,strong) CalculatorBrain *brain;
#property (nonatomic) int userPressedDecimalPoint;
#end
#implementation CalculatorViewController
#synthesize display = _display;
#synthesize userIsInTheMiddleOfEnteringNumber = _userIsInTheMiddleOfEnteringNumber;
#synthesize userPressedDecimalPoint = _userPressedDecimalPoint;
#synthesize brain = _brain;
- (CalculatorBrain *) brain{
if (!_brain) _brain = [[CalculatorBrain alloc] init];
return _brain;
}
- (IBAction)digitpressed:(UIButton *)sender {
NSString *digit = sender.currentTitle;
if (digit == #"."){
self.userIsInTheMiddleOfEnteringNumber = YES;
self.userPressedDecimalPoint++;
}
if (self.userIsInTheMiddleOfEnteringNumber && self.userPressedDecimalPoint< 2){
self.display.text = [self.display.text stringByAppendingString:digit];
NSLog(#"decimal pressed: %d times",self.userPressedDecimalPoint);
}
else{
self.display.text = digit;
self.userIsInTheMiddleOfEnteringNumber = YES;
self.userPressedDecimalPoint = 1;
}
}
So basically I have setup a property userPressedDecimalPoint and i try to use this property as a counter every time the decimal point is pressed. However from the NSLog i see that no matter how many times i press the decimal point it only shows 1 time pressed. Consequently, the output shows multiple decimal points if entered. Any suggestions would be appreciated. Thanks!
Full version of Corrected Code:
#import "CalculatorViewController.h"
#import "CalculatorBrain.h"
#interface CalculatorViewController()
#property (nonatomic) BOOL userIsInTheMiddleOfEnteringNumber;
#property (nonatomic,strong) CalculatorBrain *brain;
#property (nonatomic) int userPressedDecimalPoint;
#end
#implementation CalculatorViewController
#synthesize display = _display;
#synthesize userIsInTheMiddleOfEnteringNumber = _userIsInTheMiddleOfEnteringNumber;
#synthesize userPressedDecimalPoint = _userPressedDecimalPoint;
#synthesize brain = _brain;
- (CalculatorBrain *) brain{
if (!_brain) _brain = [[CalculatorBrain alloc] init];
return _brain;
}
- (IBAction)digitpressed:(UIButton *)sender {
NSString *digit = sender.currentTitle;
if ([digit isEqualToString:#"."]){
self.userIsInTheMiddleOfEnteringNumber = YES;
self.userPressedDecimalPoint++;
}
if (self.userIsInTheMiddleOfEnteringNumber && self.userPressedDecimalPoint< 2){
self.display.text = [self.display.text stringByAppendingString:digit];
// NSLog(#"decimal pressed: %d times",self.userPressedDecimalPoint);
}
else if (![digit isEqualToString:#"."]){
self.display.text = digit;
self.userIsInTheMiddleOfEnteringNumber = YES;
}
}
- (IBAction)operationPressed:(UIButton *)sender {
if (self.userIsInTheMiddleOfEnteringNumber) [self enterPressed];
double result = [self.brain performOperation:sender.currentTitle];
NSString *resultString = [NSString stringWithFormat:#"%g", result];
self.display.text = resultString;
}
- (IBAction)enterPressed {
self.userPressedDecimalPoint = 0;
[self.brain pushOperand:[self.display.text doubleValue]];
self.userIsInTheMiddleOfEnteringNumber = NO;
}
#end

Answer 1

Unless there is something that sets userIsInTheMiddleOfEnteringNumber to NO, any time the number is greater than one, your code will execute self.userPressedDecimalPoint = 1; and set it back to one.