Convert NSString with octal numbers to decimal int

Question

I have an NSString with octal numbers:

NSString* octal = @"247";

I'd like to convert this to an integer in base 10.

If this were a hex number I could use NSScanner scanHex method, but there is no scanOct...

Thanks!

Answer 1

The standard C library has conversion functions for this purpose:

NSString* octal = @"247";

unsigned long value;
sscanf([octal UTF8String], "%lo", &value);

NSString* decimal = [@(value) stringValue];

decimal now contains the converted base 10 value.