Tuesday, February 22, 2011

Quickie: Binary Printing

This one is probably about the right size for a phone screen question. I've seen this as print a binary string, print a decimal string, and print a hex string. They are all good and it shouldn't take someone more than a few minutes of thinking and a few minutes of scribbling to get it done.

public static String printme(int i) {
StringBuilder mOut = new StringBuilder();

while(true) {
if(i % 2 == 1) {
mOut.insert(0, "1");
} else {
mOut.insert(0, "0");
i = i / 2;
if(i == 0) {
return mOut.toString();


For the reader: code up an integer representation without using ten else-ifs or java's automatic integer to string converters. Just append chars.

No comments: