iOS Adding two numbers using 3 Text Field ??

[int3rc3pt0r]

Hey Guys ,

I am totally new to iPhone programming ..
So please don't be hard on me

Ok here is the problem

AdditionViewController.h

#import <UIKit/UIKit.h>

@interface AdditionViewController : UIViewController 
{
	IBOutlet UITextField *Number1;
	IBOutlet UITextField *Number2;
	IBOutlet UITextField *SumAnswer;
}

@property (retain, nonatomic) UITextField *Number1;
@property (retain, nonatomic) UITextField *Number2;
@property (retain, nonatomic) UITextField *SumAnswer;
-(IBAction)buttonPressed1:(id)sender;

@end

AdditionViewController.m

#import "AdditionViewController.h"

@implementation AdditionViewController
@synthesize Number1;
@synthesize Number2;
@synthesize SumAnswer;


-(IBAction)buttonPressed1:(id)sender
{
	SumAnswer.text = Number1.text + Number2.text; 
       // I want the above line to be edited so that I can get the addition
         of both the numbers in the 3rd Text Field 
}

-
-
-
-
-
@end

I am really new to iPhone programming .. I am trying to understand how
NSString can be used here .. But I am finding it a bit complicated .


If someone please tell me what the code should be ... It will be a great help .
I have to submit a mini project to my school asap .

Thanking You ,
int3rc3pt0r

 

[dejo]

https://forums.macrumors.com/threads/860548/
https://forums.macrumors.com/threads/547638/

 

[int3rc3pt0r]

https://forums.macrumors.com/threads/860548/
https://forums.macrumors.com/threads/547638/

I already checked that ..thankx anyway ...
But can anyone write code with comments so i can understand ..
and then I can explain to my teacher ...
I am not trying to be lazy here ..

Please anyone ...

 

[dejo]

I am not trying to be lazy here .

You say you're not but it certainly looks that way. The code you're looking for can be found, with some adjustments, in those threads. Don't expect us to do your homework for you.

 

[int3rc3pt0r]

You say you're not but it certainly looks that way. The code you're looking for can be found, with some adjustments, in those threads. Don't expect us to do your homework for you.

.. Ok .. I will try that ...
If I get any error I will post it here ...
Thanks ...

 

[robbieduncan]

Basically you can't add NSString objects using the binary + operator: it only works on numeric primitive types.

 

[int3rc3pt0r]

So how am I supposed to do it without NSString ??

 

[ChOas]

So how am I supposed to do it without NSString ??

1: Convert the NSStrings to integers/floats
2: Add the numbers
3: Convert the result back to an NSString.

pseudo: sumanswer = string((num1 as float) + (num2 as float));

It's all explained in the links already given.

 

[robbieduncan]

So how am I supposed to do it without NSString ??

You'll need to convert the NSString objects into something you can do maths on. The documentation or the threads linked above will help you. I'm certainly not about to tell you: learning to program is not copy/pasting from what others do, it's about understanding what is happening, building a mental model of how the system works and how your code fits into that. Personally I'd suggest learning plain, basic C as that will teach you a lot about how the machine works. You might actually then understand why @"10"+@"10" doesn't result in @"20". If Objective-C supported operator overloading (it doesn't) it might result in @"1010"...

 

[dalvin200]

So how am I supposed to do it without NSString ??

i would assume you'd need to cast the string to an integer ..

which can be found here: https://forums.macrumors.com/threads/476194/

 

[int3rc3pt0r]

Hey thankx for the guidance guys ...
I will go ahead with links ... I got the picture now ..thank a ton

Thankx