Convert Binary to Decimal in Objective C

Question

I have binary sequence in a string. How to convert it in decimal. Is there any built in function in Objective C ?

Answer 1

NSString * b = @"1101";
long v = strtol([b UTF8String], NULL, 2);
NSLog(@"%ld", v); //logs 13

The downside of this is that it only appears to produce positive numbers.