Most programmers are familiar with the "modulus" operator, which is the percent symbol in the language C and many other programming languages that have followed. Anyone who remembers learning division in elementary school will recall that when you divide a number, say 21 by a smaller number, say 5, you get a whole number part, 4 in this case, but there's a little left over. Later in arithmetic, you learned to continue the division and get 4.2, but when first learning, you would be told to...
