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CS156: Introduction to C

This is the home page for CS156, Introduction to C, a class in the Computer Science Department at CSU.
Click on the sidebar, on the left, for other class pages.

Announcements

Grades are posted

Grades have been posted. Run ~cs156/bin/grade to find out how you did.

HW4 solution

The solution to HW4 is here.

HW4: Return type of get_stats is wrong

In HW4, I got the return type of get_stats wrong—it should be void, not int:

        void get_stats(char fn[]);

HW3: parameters to calculate_interest:

In HW3, the description of the required function calculate_interest erroneously stated that the first parameter was a year. It should, instead, be a book 'number, 1–14.

HW3: Strange formats

If you copied HW3’s main from the assignment before noon Sunday, double-check your scanf formats. Make sure they don’t have any extra dots in them:

	scanf("%c%*c", &cmd);       // Read command, ignore enter key
	scanf("%d%*c", &year);
	scanf("%d%f%*c", &booknum, &price);

	scanf("%c.%*c", &cmd);       // Read command, ignore enter key
	scanf("%d.%*c", &year);
	scanf("%d.%f.%*c", &booknum, &price);

HW3: Book Number

I've added the following to the HW3 specification:

• You may assume that the user will enter a number 1–14 when prompted for a book number.

HW1: Example Was Wrong

In HW1, the sample output for 113 and 355 was flawed–it printed out the last digit of the first number, instead of the second number. It’s fixed, now.

HW1: Read the Specifications

HW1 states: “You may ONLY use two int variables in your entire program. No other variables, of any type, are allowed.” So far, three people have turned HW1, and two of the three submissions have violated this rule. This is not a good sign.

Favorite Editor

The last question of the CS155 final exam was “What’s your favorite editor? Why?” Here are the answers:

Some of my favorite reasons “Why?”:

• pico, cause it starts with the letter “p”, of course!
• pico because I said so
• pico, because I am using a mac (different keyboard)
• vim because it is like word
• vi—I like a challenge
• emacs; I know how to save & exit
• notepad; because I am a masochist
• Blue! Because it’s the color of my water
• I don’t have a favorite editor because I really dislike Unix and just want to go back to using windows!
• See you next semester!

Homework counts more

In CS156, homework is 40% of your grade. In CS155, it was only 20%.

Syntax Highlighting

Both emacs and vi provides mechanisms for highlighting C syntax, such that it is easy to differentiate between keywords, comments, variables, etc. In emacs, select “Options” and click on “Syntax Highlighting (Global Font Lock Mode)”. In vi, enter, “:syntax on”. Also consider using gvim instead of vi or vim.