• intro (due 20140124)
• "Hello, World!" (due 20140131)
• data types (due 20140207)
• Squares (due 20140214)
• Day of Week (due 20140221)
• Multiply by 11 (due 20140228)

• WEATHER happened. People still showed up, and we talked about the data type project for a bit, as well as the squares project, and while we did go over new stuff (if statements), I plan to review if() statements again next week.
• Data Types, continued
  • Here's another take on bases, conversions, representations, and applied logic
  • talked about casting some more
  • reviewed printf() format specifiers
    • on the lab46 command-line, you can type man 3 printf to view the on-line manual for the C printf() function (it has a biggish section on the format specifiers)
• reviewed squares project
  • input with scanf()
  • 35^2 = 3*4 25 = 1225
  • use simple math expressions to manipulate your input (115 OPERATION NUMBER = 11)
• if()/selection statements – let the computer make informed decisions, so long as that decision is true or false.
  • if() statements evaluate a condition. Conditions can be a number, or they can be the result of some relational expression. Operators are:
    • == (is equal to)
    • != (is not equal to)
    • < (is less than)
    • ⇐ (is less than or equal to)
    • > (is greater than)
    • >= (is greater than or equal to)
  • a common mistake is to put a single equal sign (=) in a condition.
    • this doesn't check equality, it sets it, and setting is always true
  • using && and ||, we can have compound if() statements
  • if you use an if(), you can have:
    • at most one if() statement
    • 0 or more else if() statements
    • 0 or 1 else statements
• Looked briefly at ASCII characters and their numeric representation ('A' is 65, space is 32, 'a' is 97, '0' is 48)
• showed some more mental math

int number = 0;
 
printf("Enter a number (0-10): ");
scanf("%d", &number);
 
if (number < 0)
{
    printf("Error, value is less than 0!\n");
}
else if (number == 1)
{
    printf("ONE!\n");
}
else if ((number <= 10) && ((number % 2) == 0)) // detect even number (compound if)
{
    printf("Even number of %d\n", number);
}
else if ((number == 3) || (number == 7)) // compound if using OR connective
{
    printf("you entered a %d\n", number);
}
else if ((number > 4) && (number < 10)) // compound if using AND connective
{
    printf("remaining odd number of %d\n", number); // how will this only hit 5 or 9?
}
else
{
    printf("value is greater than 10!\n");
}

• Signed values
  • how to represent
  • how to manually encode
    • one's complement (why is this problematic?)
    • two's complement
      • invert, then add 1
  • what this does to the range
  • impact on resulting quantity
• discuss next week's project: squares
  • input with scanf()
    • need to pass variables by address
    • formatted text string same as with printf()

• We covered some C programming details relating to the data types project:
  • printf/fprintf
    • STDIN/STDOUT/STDERR
    • format string specifiers
      • %d
      • %u
      • %ld
      • %lu
      • %hd
      • %hu
      • %hhd
      • %hhu
      • %c
      • %s
      • the space allocation/zero padding optional value that can be specified within the format string specifier
  • sizeof() function
    • relatedly:
    • low and high values within a fixed size range
    • roll-over
  • logical operators
  • type casting
• We also looked at cloning BitBucket repositories onto Lab46

• Welcome! Be sure to:
  • Read over the syllabus
  • Subscribe to the class mailing list
  • Using the tutorial, set up a screen session and get on #csci on irc
• Get familiar with logging into the pod systems, and once there:
  • opening up a terminal
  • logging that terminal onto Lab46 for class work and attendance
• Get familiar with how to log onto Lab46, and once on:
  • change to your src/ subdirectory
  • create/edit .c files (such as hello.c), and how to save/exit
  • compile the C program (.c file(s)) into an executable with gcc
  • execute the compiled C program (the executable) by specifying a path: ./program_name
• Familiarize yourself with your Opus, and once there:
  • customize it (title/subtitle)
  • add an introduction
  • create your first week content
• Contemplate our first set of programs we're going to write:
  • "Hello, World!" program (due by 20140131)
  • data type range program (due by 20140207)
  • Be aware of the Mental Math programs coming down the pipeline:
    • Squares program (due by 20140214)
    • Day of Week program (due by 20140221)
    • Multiply by 11 program (due by 20140228)