Decimal to Binary Converter

This converter moves a number between binary, octal, decimal and hexadecimal in any direction, including the part after the point. Enter the value, say which base it is written in, and all four bases come back at once, each marked as exact or cut short where a fraction does not terminate. A second mode shows the repeated-division steps behind a whole-number conversion and checks the answer by place value. The digits are converted directly rather than through a floating point value, so a number wider than 64 bits stays exact and a repeating fraction is cut rather than rounded.