Naive base-conversion as you described takes quadratic time; you do about n bigint-by-smallint divisions, most of which take time linear in the size of the n-bit bigint. You can do base conversion in O(M(n) log(n)) time, however, by picking a power of target-base that’s roughly the square root of the to-be-converted number, doing divide-and-remainder by … Read more
The radix is another name for base, i.e. 2 for binary, 10 for decimal, 16 for hexadecimal, explained in more detail on the Mozilla Developer Network site. In your example there is no radix parameter, so the interpreter will fall back to the default behaviour, which typically treats numbers as decimal, unless they start with … Read more
This is something people trip over all the time, even when they know about it. 🙂 You’re seeing this for the same reason parseInt(“1abc”) returns 1: parseInt stops at the first invalid character and returns whatever it has at that point. If there are no valid characters to parse, it returns NaN. parseInt(8, 3) means … Read more
To understand why this doesn’t work, you need to understand what colnames<- does. Like every function in that looks like it’s modifying an object, it’s actually modifying a copy, so conceptually colnames(x) <- y gets expanded to: copy <- x colnames(copy) <- y x <- copy which can be written a little more compactly if … Read more
You need to specify the radix. There’s an overload of Integer#parseInt() which allows you to. int foo = Integer.parseInt(“1001”, 2);
You can treat the sign as a special kind of digit. You sort the pile on the units, then the tens, etc. and finally on the sign. This does produce a reversed order for the negatives, you then simply reverse the contents of that bucket. It’s how old mechanical card sorters worked.
When you perform the ParseInt operation with the radix, the 11 base 16 is parsed as 17, which is a simple value. It is then printed as radix 10. You want: System.out.println(Integer.toString(11, 16)); This takes the decimal value 11(not having a base at the moment, like having “eleven” watermelons(one more than the number of fingers … Read more
How to convert an integer to a string in any base?