This document provides an overview and introduction to the CS50 course. It covers topics like problem set 0, sectioning, office hours, basic C syntax like main functions and printf statements, variables, data types, libraries, operators, and compiling and running programs. Code snippets and explanations are provided for many core programming concepts.

1. This is CS50.

2. scribe notes

3. problem set 0

4. walkthrough
cs50.net/psets

5. sectioning
cs50.net/section

6. office hours
cs50.net/ohs

10. int
main(void)
{
printf("hello,
world!n");
return
0;
}

11. statements

12. statements
printf("hello,
world!n");

13. loops

14. loops
while
(true)
{
printf("hello,
world!n");
}

15. loops

16. loops
for
(int
i
=
0;
i
<
10;
i++)
{
printf("hello,
world!n");
}

17. variables

18. variables
int
counter
=
0;
while
(true)
{
printf("%dn",
counter);
counter++;
}

19. Boolean expressions

20. Boolean expressions
(x
<
y)
((x
<
y)
&&
(y
<
z))

21. conditions
if
(x
<
y)
{
printf("x
is
less
than
yn");
}
else
if
(x
>
y)
{
printf("x
is
greater
than
yn");
}
else
{
printf("x
is
equal
to
yn");
}

22. arrays
string
inventory[1];
inventory[0]
=
"Orange";

23. #include
<stdio.h>
int
main(void)
{
printf("hello,
world!");
return
0;
}

24. 10000011 00000001 00010001 00000000 00111101 11111100 01110100 00111101
00000000 01000000 00000000 00000000 00000000 00000000 00000000 00000000
10010000 00000000 00000000 00000000 01010000 00000000 00000111 00110000
00001011 00000001 00001011 00000011 00001010 00000000 00000000 00000000
00000000 00100000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00100000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
01110000 00010000 00000000 00100000 00000001 00000000 00000000 00000000
00000000 00000000 00000000 00100000 00000001 00000000 00000000 00000000
00000000 00000000 00000000 01000000 00000001 00000000 00000000 00000000
00000000 00100000 00000000 01000000 00000001 00000000 00000000 00000000
11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111111
10010000 10000000 00000000 01000000 00000001 00000000 00000000 00000000
00101110 01100100 01111001 01101110 01100001 01101101 01101001 01100011
10110000 00000100 00000000 00100000 00000001 00000000 00000000 00000000
10110000 00000100 00000000 00100000 00000001 00000000 00000000 00000000
10100000 00000001 00000000 00000000 00000000 00000000 00000000 00000000
10110000 00000100 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00100000 00000000 00000000
...

26. how to write a program

27. how to compile a program
clang
hello.c

28. how to run a program
./a.out

29. how to compile a program
clang
-­‐o
hello
hello.c

30. how to run a program
./hello

31. how to compile a program
make
hello

32. functions
main

33. Standard Library
stdio.h
printf
...

34. CS50 Library
cs50.h
GetChar
GetDouble
GetFloat
GetInt
GetLongLong
GetString

35. printf
%c
%d
%f
%lld
%s
...

36. escape sequences
n
r
t
'
"
0
...

37. math
+
-­‐
*
/
%

38. primitive types
char
double
float
int
long
long
...

39. CS50 types
bool
string
...

40. precedence
http://www.difranco.net/cop2220/op-prec.htm

41. how to compile a program
clang
-­‐o
hello
hello.c
-­‐lcs50

42. how to compile a program
make
hello

43. to be continued...