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# import <Foundation/Foundation.h>

@interface Calculator : NSObject

@property (nonatomic) float numerator; @property (nonatomic) float denominator; @property (nonatomic) float total;

# import "Calculator.h"

@implementation Calculator

```self.total=self.numerator+self.denominator;
```

}

-(void) divide{ self.total=self.numerator/self.denominator; } /// -(float)divideOp { float result=0; @try {

```    if (self.denominator != 0) {
result = (self.numerator / self.denominator);
} else {
result = NAN;

}
} @catch (NSException *exception) {
// deal with the exception
NSLog(@"Can't divide by 0!");
}

return result;
```

}

# import "Calculator.h"

int main(int argc, char * argv[]) { @autoreleasepool { return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

```    Calculator * calculator1 =[[Calculator alloc]init]; --- (Here it got a popup that code will never execute)

calculator1.numerator=10;
calculator1.denominator=5;