Question

I trying to do conversions between Binary, Octal, Decimal and Hexadecimal in Objective-C.
I had problems converting Octal to Decimal.

I have tried the following:

NSString *decString = [NSString stringWithFormat:@"%d", 077];

It works fine, returning 63 as expected, but my Octal value is a NSString. How can I tell the computer that it is a Octal;

I know there is a method called “scanHexInt:” which I used to convert Hexadecimal to decimal, but it seems there is no scanOctInt…

Any help would be appreciated!

Answer 1

The cleanest solution is probably:

long result = strtol(input.UTF8String, NULL, 8);

or

long long result = strtoll(input.UTF8String, NULL, 8);