How to convert from int to string in objective c: example code

Question

I am trying to convert from an int to a string but I am having trouble. I followed the execution through the debugger and the string 'myT' gets the value of 'sum' but the 'if' statement does not work correctly if the 'sum' is 10,11,12. Should I not be using a primitive int type to store the number? Also, both methods I tried (see commented-out code) fail to follow the true path of the 'if' statement. Thanks!

int x = [my1 intValue]; 
    int y = [my2 intValue]; 
    int sum = x+y;
    //myT = [NSString stringWithFormat:@"%d", sum];
    myT = [[NSNumber numberWithInt:sum] stringValue];

    if(myT==@"10" || myT==@"11" || myT==@"12")
        action = @"numGreaterThanNine";

Is there a reason you're putting the integer into a string? It would be so much easier to write your test as `if (sum >= 10 && sum <= 12)` — Alex, Jul 09 '09 at 16:17
If the answers bellow confuse you, check out this related question: http://stackoverflow.com/questions/3414644/how-to-convert-integer-to-string-in-objective-c-closed — Florin, Dec 15 '10 at 13:18

score 185 · Answer 1 · answered Feb 11 '11 at 17:41

185

If you just need an int to a string as you suggest, I've found the easiest way is to do as below:

[NSString stringWithFormat:@"%d",numberYouAreTryingToConvert]

answered Feb 11 '11 at 17:41

Scott

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Robert · Answer 2 · 2016-08-23T09:53:46.660

182

You can use literals, it's more compact.

NSString* myString = [@(17) stringValue];

(Boxes as a NSNumber and uses its stringValue method)

edited Aug 23 '16 at 09:53

answered Dec 04 '12 at 13:05

Robert

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@RavindranathAkila - `stringWithFormat` is more flexible / powerful and should be used in general. This is just a shortcut if its a simple conversion you are after. – Robert Mar 24 '14 at 09:52
I prefer this over stringWithFormat, short and concise. – Satheesh Mar 09 '21 at 07:27

grahamparks · Accepted Answer · 2009-07-09T16:18:48.000

33

The commented out version is the more correct way to do this.

If you use the == operator on strings, you're comparing the strings' addresses (where they're allocated in memory) rather than the values of the strings. This is very occasional useful (it indicates you have the exact same string object), but 99% of the time you want to compare the values, which you do like so:

if([myT isEqualToString:@"10"] || [myT isEqualToString:@"11"] || [myT isEqualToString:@"12"])

edited Jul 09 '09 at 16:18

answered Jul 09 '09 at 16:03

grahamparks

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Slight typo, a missing : in the 2nd comparison. – marcc Jul 09 '09 at 16:07

score 12 · Answer 4 · edited Sep 29 '16 at 09:18

12

== shouldn't be used to compare objects in your if. For NSString use isEqualToString: to compare them.

edited Sep 29 '16 at 09:18

Vasily Kabunov

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answered Jul 09 '09 at 15:58

Terry Wilcox

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score 9 · Answer 5 · edited Apr 29 '13 at 10:54

9

int val1 = [textBox1.text integerValue];
int val2 = [textBox2.text integerValue];

int resultValue = val1 * val2;

textBox3.text = [NSString stringWithFormat: @"%d", resultValue];

edited Apr 29 '13 at 10:54

Robert

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answered Feb 02 '12 at 05:13

Amol

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score 5 · Answer 6 · edited Jun 24 '16 at 10:48

5

Simply convert int to NSString use :

  int x=10;

  NSString *strX=[NSString stringWithFormat:@"%d",x];

edited Jun 24 '16 at 10:48

maazza

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answered Jun 24 '16 at 10:24

Ashwini Chougale

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score 3 · Answer 7 · answered Nov 24 '20 at 08:36

3

Dot grammar maybe more swift!

@(intValueDemo).stringValue

for example

int intValueDemo  = 1;
//or
NSInteger intValueDemo = 1;

//So you can use dot grammar 
NSLog(@"%@",@(intValueDemo).stringValue);

answered Nov 24 '20 at 08:36

leonardosccd

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How to convert from int to string in objective c: example code

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