CISC181 8am 02/14/05

(1) Continue going over the Farenheit to Celsius program at:

   http://udel.edu/~pconrad/cisc181/05S/work/labs/lab01/lab01b.cc


Three ways to handle the std:: stuff

  (1) using namespace std;
  (2) put it before each reference to "cin", "cout", etc..
      e.g. 
        std::cout << "Hello World" << std::endl;
  (3) Each individual item, a separate using statement,
      e.g.
         using std::cout;
         using std::endl;
         using std::cin;

    For reasons that are more apparent when you are working on 
    a large real-world project, in the real world (professional
    large scale c++ development, method 3 is preferred)

    On labs, projects, and anything you do for this class where
    time is not an issue, I would prefer you to use method 2 or 3.

    When time is an issue, e.g. in lecture, quizzes, or exams,
    method 1 is perfectly acceptable.

 Types:
     int for integers
     float or double for real numbers

     double is almost always preferred over float
     you need to know that float exists, but you should almost always
        use double instead.

     The number of bits used to represent int, float, double can vary
     from system to system.
  
     On strauss how big is an int, float or double?   How can we tell?

     Use the built-in feature of C++ "sizeof".

   (side note on emacs: to visit another file,
     use CTRL/X, CTRL/F).

   (another emacs side note:  

      CTRL/A beginning of line
      CTRL/E end of line
      CTRL/K kill line
      CTRL/Y yank (paste)
      CTRL/spacebar OR CTRL/shift-2 "set mark"
      esc-W  (written M-w "meta-w") copy
          of "region" (between "point" and "mark"... "point" is where the cursor is.
      )

If you are in a terminal session in emacs, and you want to drop to 
a command line temporarily, use "CTRL/Z" to temporarily drop to 
a command line (putting emacs in the "background".)  Use "fg" at the
command line to bring emacs back into the "foreground".

Read more about "foreground" and "background" in your Just Enough Unix textbook
by Anderson.. these are important Unix concepts.

CTRL/X B (not CTRL/X CTRL/B) allows you to switch between two files you
are "visiting" in emacs.

CTRL/X CTRL/W is how you do a "save as" (W stands for "write file").

 Compiling the "sizeofDemo.cc" program

> make demoSizeof.cc
`demoSizeof.cc' is up to date.
> make demoSizeof
CC    -o demoSizeof demoSizeof.cc 
> make demoSizeof
`demoSizeof' is up to date.
> ./demoSizeof 
sizeof(a) is 4
sizeof(b) is 8
sizeof(c) is 4
sizeof(int) is 4
sizeof(float) is 4
sizeof(double) is 8

(3) Modifying the farenToCelsius program to do milesToKm conversion.

(4) Modifying that program to use a loop to print a table of values.