Programming in Objective-C, Sixth Edition

The if-else Construct

If someone asks you whether a particular number is even or odd, you will most likely make the determination by examining the last digit of the number. If this digit is 0, 2, 4, 6, or 8, you will readily state that the number is even. Otherwise, you will claim that the number is odd.

An easier way for a computer to determine whether a particular number is even or odd is affected not by examining the last digit of the number to see whether it is 0, 2, 4, 6, or 8, but by simply determining whether the number is evenly divisible by 2. If it is, the number is even; otherwise, it is odd.

You have already seen how the modulus operator % is used to compute the remainder of one integer divided by another. This makes it the perfect ...