Converting a long string into number accurately in ios

Question

Let my string is 77777788888 after converting to float its coming as 77777788928. But I want the accurate number

I have already tried with [str floatValue],[str doubleValue] and [str longlongValue]

This might not be the case, but if you're using this to save for example a telephone number or something of the likes (something that doesn't need mathematical manipulations), you might be better of using a NSString instead. — tombrtls, Nov 07 '12 at 09:59

score 0 · Answer 1 · answered Nov 07 '12 at 08:31

0

To float

float myFloat = [myString floatValue];

To Double

double myDouble = [myString doubleValue];

answered Nov 07 '12 at 08:31

Future2020

score 0 · Answer 2 · answered Nov 07 '12 at 08:45

NSLog(@"%.0f", [@"77777788888" floatValue]);
NSLog(@"%.0f", [@"77777788888" doubleValue]);
NSLog(@"%lld", [@"77777788888" longLongValue]);

Produces the output

77777788928
77777788888
77777788888

So if you are not getting good results, something else is wrong.

score 0 · Answer 3 · edited May 23 '17 at 12:27

0

maybe the problem is that your double is going out of range, check this other question

edited May 23 '17 at 12:27

Community

answered Nov 07 '12 at 08:47

tkanzakic

score 0 · Answer 4 · answered Nov 07 '12 at 08:49

int is a 32 bit/4 byte value.

I am surprised are cannot comprehend (as of now), why you are getting that.

For now, you can use the following and this will work —

NSString *string = @"77777788888";
NSLog(@"%lld", [string longLongValue]);

I'll surely post a reply when I understand the issue.

Regards

4 Answers4