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
– Alex, Commented Jul 9, 2009 at 16:17
If the answers bellow confuse you, check out this related question: stackoverflow.com/questions/3414644/… — Florin
– Florin, Commented Dec 15, 2010 at 13:18

Scott · Accepted Answer · 2011-02-11 17:41:16Z

189

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, 2011 at 17:41

Scott

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Comments

Robert · Accepted Answer · 2016-08-23 09:53:46Z

185

You can use literals, it's more compact.

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

(Boxes as a NSNumber and uses its stringValue method)

edited Aug 23, 2016 at 9:53

answered Dec 4, 2012 at 13:05

Robert

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2 Comments

Robert Over a year ago

@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.

Satheesh Over a year ago

I prefer this over stringWithFormat, short and concise.

grahamparks · Accepted Answer · 2009-07-09 16:18:48Z

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 9, 2009 at 16:18

answered Jul 9, 2009 at 16:03

grahamparks

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1 Comment

marcc Over a year ago

Slight typo, a missing : in the 2nd comparison.

Vasily Kabunov · Accepted Answer · 2016-09-29 09:18:11Z

12

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

edited Sep 29, 2016 at 9:18

Vasily Kabunov

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answered Jul 9, 2009 at 15:58

Terry Wilcox

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Comments

Robert · Accepted Answer · 2013-04-29 10:54:37Z

10

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

int resultValue = val1 * val2;

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

edited Apr 29, 2013 at 10:54

Robert

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answered Feb 2, 2012 at 5:13

Amol

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Comments

maazza · Accepted Answer · 2016-06-24 10:48:12Z

5

Simply convert int to NSString use :

  int x=10;

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

edited Jun 24, 2016 at 10:48

maazza

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answered Jun 24, 2016 at 10:24

Ashwini Chougale

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Comments

tanpengsccd · Accepted Answer · 2020-11-24 08:36:02Z

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, 2020 at 8:36

tanpengsccd

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