1. CS113 Introduction to C
Instructor: Hubie Chen Web:

2. Administrivia Note: All of this information is on web site!
Class is four weeks
Office hours (subject to change!): Thursday 1:30-2:30p, Wednesday 4:35-5:35p
Grading: As much as I would like to give all of you A’s, this class is S/U only
Prerequisite: CS100 or equivalent
I reserve the right to give out quizzes. Keep up with the reading!
Assignments once a week (4 total), due on Friday except first one due on Monday (no, silly, that’s one week from today)
Turn in printout of program
Grades on Assignments: On a scale from = Perfect, 2 = Good, 1 = Incomplete and/or significant errors
I guarantee you a S if all assignments completed with score of >= 2, and decent performance on quizzes
Failing to complete two assignments results in a U.

3. More Course Details
Textbooks: I recommend purchasing both (K&R, Kelley/Pohl)
Compiler: I recommend use of Metroworks Codewarrior.
Collaboration: You may discuss programs with others, but all code must be your own.

4. Why learn C?
“Least common denominator” – good building block for learning other languages
Subset of C++, similar to Java
Closeness to machine allows one to learn about system-level details (e.g., C only has call-by-value)
Portable – compilers available for most any platform!

5. The canonical “first C program”
#include <stdio.h>
void main() {
printf( “Hello, world!\n” ); }

6. That wasn’t too hard, let’s try another!
#include <stdio.h>
void main() {
int x = 1, y;
int sum;
y = 3;
sum = x + y; /* adds x to y, places value
in variable sum */
printf( “%d plus %d is %d\n”, x, y, sum ); }

7. A minor perturbation… #include <stdio.h> void main() {
int x = 7, y;
char id;
printf( “Enter a letter, by which I will identify you\n” );
scanf( “%c”, &id );
printf( “Now enter a number!\n” );
scanf( “%d”, &y );
printf( “%c, if nothing else, I know this:” , id);
printf( “%d times %d is %d\n”, x, y, x*y ); }

8. Summing the numbers 1 thru 10.
#include <stdio.h>
void main() {
int i = 1, sum = 0;
while( i <= 10 )
sum = sum + i;
i = i + 1; }
printf( "Sum = %d\n", sum );
for( i = 1; i <= 10; i++ ) {
sum = sum + i; }
Alternative to while loop! Better, I think.

9. Your Homework
Read chapters 1, 2, of Kelley/Pohl, OR chapters 1, 2 of K&R.
Write a “hello world” program and some other simple programs in the programming environment which you plan to use.