Add a memo-function to store a number
Start my rearranging the buttons to make space for three new ones:
![iOS Dev – Assignment #2 - Extra Task – Additional Buttons](https://cs193p.m2m.at/wp-content/uploads/2012/12/iOS-Dev-–-Assignment-2-Extra-Task-–-Additional-Buttons-206x300.png)
Create a variable to store the value:
float numberInMemory;
Initialize it:
- (void)viewDidLoad { ... numberInMemory = 0; }
And connect the buttons to suitable methods:
- (IBAction)addMemoryButtonPressed:(UIButton *)sender { numberInMemory += [self.numberTextField.text floatValue]; } - (IBAction)subtractMemoryButtonPresed:(UIButton *)sender { numberInMemory -= [self.numberTextField.text floatValue]; } - (IBAction)getMemoryButtonPressed:(UIButton *)sender { self.numberTextField.text = [NSString stringWithFormat:@"%@", [NSNumber numberWithFloat:numberInMemory]]; }
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