An introduction to categories in computing by Jay C.B. PDF

By Jay C.B.

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Well, there's no corresponding bin () function but there is actually a little trick here. If you have the correct prefix in place for any of the number systems (0, ob, or Ox), you can use oct() to convert it to decimal. For example, print oct("ob11010") prints 26. Operators Now we know how to specify our strings and numbers, let's see what we can do with them. The majority of the things we'll be looking at here are numeric operators (operators that act on and produce numbers) like plus and minus, which take two numbers as arguments, called operands, and add or subtract them.

We can ask if one value and another value are both true, or if one value or another value are true, and so on. 29 30 CHAPTER 2 SCALARS The operators even resemble the bitwise operators. To ask if both truth values are true, we would use && instead of &. ; this has a higher precedence than the comparison operators, so use parentheses. (2>3) while this one tests whether ! 2>3 2 is a true value. 2 is therefore a false value, which gets converted to 0 when we do a numeric comparison. We're actually testing if 0 is more than 3, which has the opposite effect to what we wanted.

There is another type of string-one which has been single-quoted. Predictably, they are surrounded by single quotes: ' ' . The important difference is that no processing is done within single-quoted strings, except on \\ and \' . We'll also see later that variable names inside double-quoted strings are replaced by their contents, whereas single-quoted strings treat them as ordinary text. We call both these types of processing interpolation, and say that single-quoted strings are not interpolated.

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An introduction to categories in computing by Jay C.B.


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