Errata for Modern C for Absolute Beginners
Chapter 5.2 Arithmetic Operators
Replace the 4th paragraph with: Let us look at what the % modulus (or modulo) operator does. The result of the x % y expression is the remainder of the x / y integral division. For example, the result of the 9 % 2 is equal to 1. With integral division, 9 divided by 2 equals 4, so the result of the modulus operation is 1, because 9 minus 8 equals 1.