Introduction to Chapter 3

• Chapter 3 is easy and hard.
• It is easy because it it still about data types.
• It is hard because most of these data types are numbers.
• She has a figure that shows all of the data types in c++
  • 
  • Note character (char) is listed as an integer type
  • And strings are not listed at all?
• Remember, characters are just the ascii value
  • So the data stored there is actually an integer type.
  • This is treated different than all other integer types for I/O
  • But as an integer in every other way.
• Strings are not really a built in data type
  • They are an example of a class, sometimes called objects.
  • We will study a little more about strings in this chapter.
  • We will study objects in CSCI 230 and CSCI 330
• We have started to learn about another class, the stream
  • We have examples of cin and cout.
  • These are data streams.
• Rounding out the tree
  • Simple data types hold a single value.
    • We will mostly address these in chapter 3.
    • But enums will be the start of 230
  • Structured data types can hold multiple values.
    • These will mostly be addressed in 230
  • Addresses point to other data.
• Integer types hold integers
• floating point types hold real numbers.
• Both floats and ints have different "sized" values.
  • For integers
    • A bit is a 0 or a 1.
    • A char is 8 bits.
    • A short is bigger than a char (usually 16 bits)
    • An int is bigger than a short (usually 32 bits)
    • A long is bigger than an int (but possibly not)
    • A bool is wierd, different and useful in chapter 5.
  • Floats are the same but the names are
    • float
    • double
    • long double
• And integers can be signed or unsigned.