Bashing out low-level code, it can be annoying to re-type the same commands over and over when you need to repeat a routine. Matt Godbolt explains how we can save frequently used code as a subroutine and reuse whenever its needed. Matt Godbolt is known as the creator of Compiler Explorer, among other things! Find out more about him here: Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. More at