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No results when I run the code even after it says it was built successfully.

I have a written some basic code for a Calculator app in objective C , just to test it. I have no programming experience so it is a learn and figure out thing but I cant seem to get it . It was able to built but I am not see any result, please advice. Thanks!

import <Foundation/Foundation.h>

@interface Calculator : NSObject

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

-(void)add; -(void)divide;


import "Calculator.h"

@implementation Calculator

-(void) add{



-(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 <UIKit/UIKit.h>

import "AppDelegate.h"

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 add];
    [calculator1 divide];