CODEWITHSUNDEEP
objective-cxcodebase-conversion
user3062299
user3062299

Reputation: 55

How do I convert a decimal to hexadecimal using Objective C?

I've been working on a calculator and I wanted to implement conversions from decimal to octal and from decimal to hexadecimal. I'm new to Xcode and Objective C, but I've managed to get a conversion from decimal to octal, it just doesn't seem to work with hexadecimal.

Here's the code I've written to convert a double to octal:

double result = 0;
...
double decToOct = [self popOperand];
NSString *oct = [NSString stringWithFormat:@"%llo", (long long)decToOct];
result = [oct doubleValue];

Using the same scheme (obviously that includes changing @"%llo" with @"%llx") the conversion to hexadecimal works up to a certain point. It does numbers 0 through 9 just fine, but once it hits 10, it comes up as 0. To test, I also input 5395 and it displayed 1513, the desired result.

Because of this, I can only assume that for some reason my code does not want to input the actual letters of the hexadecimal values (e.g. 11 would convert to B but it shows up as 0) .

Any suggestions? Thanks in advance.

UPDATE: In addition, I have also been using this to display the result:

double result = [self.brain performOperation:operation];
self.display.text = [NSString stringWithFormat:@"%g", result];

result, as listed from the top, is an argument which is eventually returned here, to self.brain performOperation:operation. This is supposed to handle the display of all operations, including: addition, multiplication, etc. but also octal and hexadecimal. Again, it works fine with octal, but not with hexadecimal.

Upvotes: 0

Views: 2554

Answers (2)

Prashant Tukadiya
Prashant Tukadiya

Reputation: 16416

If you know your string only contains a valid decimal number then the simplest way would be:

NSString *dec = @"254";
NSString *hex = [NSString stringWithFormat:@"0x%lX", 
              (unsigned long)[dec integerValue]];
NSLog(@"%@", hex);

Upvotes: 0

charanjit singh
charanjit singh

Reputation: 186

Try this, May be it will help you. Please do let me know if i am wrong here:--->

NSString *decStr = @"11";
NSString *hexStr = [NSString stringWithFormat:@"%lX",
                 (unsigned long)[dec integerValue]];
NSLog(@"%@", hexStr);

Upvotes: 3

Related Questions