C language

As I started studying in university, I had to learn C. These are my notes, just in case I forget something, so I can quickly come back and review them.

Data types

Data type	Size	Value range
signed int	2 or 4 bytes	-32,768 to 32,767
unsigned int	2 or 4 bytes	0 to 65,535
float	4 bytes	1.2E-38 to 3.4E+38 (6 decimal places)
double	8 bytes	2.3E-308 to 1.7E+308 (15 decimal places)
char	1 byte	-128 to 127
unsigned char	1 byte	0 to 255

Format specifiers

Name	Usage
%d, %i	Signed decimal integer
%u	Unsigned decimal integer
%f	Decimal floating point
%e, %E	Scientific notation
%g, %G	Automatically chooses %f or %e/%E depending on the value
%c	Single character

Input/output

C language uses functions like printf() and scanf() for input and output:

• printf(const char *format, ...); — Outputs formatted data.
• scanf(const char *format, ...); — Reads formatted input.