Introducing operations on characters

The integer value of the letter 'a' is 97. When we treat that value as a char, the 97 value becomes 'a'. Since characters are internally represented as integers, any of the integer operations can be applied to them too. However, only a couple of operations make sense to apply to characters – the additive operators (that is, addition and subtraction). While multiplying and dividing characters are legal, those operations never produce any practical or useful results:

• char - char yields int. The result represents the distance between characters.
• char + int yields char. This yields the character that is the specified distance from the original character.
• char - int yields char. This also yields the character that is the specified distance from the original character.

So, 'a' + 5 is 'f'; that is, 97 + 5 is 102, which as a character is 'f'. 'M' - 10 is 'C&apos...