Week 1: Our First Section!

Hello and welcome to CS50!

My name is Omer, and I’m going to be your TF for this semester. I’m really excited to get to know all of you and help you learn computer science!

Welcome to the first section of CS50! This week we will be learning programming fundamentals in C. C is a powerful language that is used in many different applications, from operating systems to video games. It is a great language to learn because it is relatively low-level, meaning that you have a lot of control over how your code runs. This week we will be learning about variables, conditionals, loops, and more!

Resources:

Section-Specific:

Sections are held Thursdays 9AM-11:45AM in 2 Arrow St. Room 420
Section Slides

Course-wide:

Office Hours:

My Office Hours: Saturday, September 14 1-2pm in HSA 4th Floor (67 Mt. Auburn Street)
- May change in the future
All-Staff Office Hours: Sunday 3-5PM in Widener Library
Office Hours Schedule
- Add this Google Calendar
If you have any questions at all, email me!

Terminal Commands

Make a folder/subdirectory

$ mkdir world

Your folders will now look like this on the left side of VS Code:

other-folder1/
other-folder2/
world/

Enter a folder in terminal

$ cd world

You will now be in the world folder:

world/ $

List contents of a folder

$ ls

You will see the contents of the folder:

$ ls 
other-folder1/ other-folder2/ world/
$

Exit a folder / go to a higher-level folder

psets/1/ $ cd ..

You will know be in the parent folder psets:

psets/ $

Create a file

$ code hello.c

Compile a C file

$ make hello

Run a C file

$ ./hello

Common Patterns for the Problem Set

`do while` loops

int input;
do
{
    input = get_int("Enter an integer: ");
}
while (input < 0)

`printf`

printf prints a formatted string to the terminal:

// print text
printf("hi\nhi")
// print the value of variables
int num = 2
printf("the value of this number is %i", num)
// can also do for strings, doubles, floats, etc. (%s, %d, %f, etc.)