Binary Conversion Drill

Convert between different number representations. All binary numbers are eight bits.

On the HTML site, fill in the blank with your answer (as a quoted string, e.g. "1A"), then click Run Code on the exercise to check. Reload the page for a new random question. In the PDF, the reference implementation is shown instead (interactive exercises need a browser).

Number base conversion

A random question is generated once per page load using an ojs cell, then passed into the Python exercise cells below via the input cell option – this keeps the question stable across repeated “Run Code” clicks (setup blocks re-run on every evaluation, so randomising there would change the question out from under the learner).

base_names = ["Decimal", "Hexadecimal", "Octal", "Unsigned Binary"]
base_shuffled = [...base_names].sort(() => Math.random() - 0.5)
base_u = base_shuffled[0]
base_v = base_shuffled[1]
base_n = Math.floor(Math.random() * 256)

Signed number format conversion

fmt_names = ["Decimal", "Signed Magnitude", "Ones' Complement", "Two's Complement", "Excess-128"]
fmt_shuffled = [...fmt_names].sort(() => Math.random() - 0.5)
fmt_u = fmt_shuffled[0]
fmt_v = fmt_shuffled[1]
fmt_n = Math.floor(Math.random() * 255) - 127