In C you might find yourself using double quotes in some cases, and single quotes in other cases.

In some languages, there’s no difference between the two. But in C, there is a difference, and you’ll use one vs the other depending on the need.

When can you use single quotes and when can you use double quotes?

Single quotes are used to identify a single character (char value):

char letter = 'a';

Double quotes are used to create a string literal:

char *name = "Flavio";

Note that you can create a single-letter string literal:

char *letter = "a";

But remember that a string is composed by the characters of the string, plus a 0 character at the end, which makes single-letter string literals take double the space of a single character.

Lessons in this unit:

0:	Introduction
1:	Input and output
2:	Variable scope
3:	Static variables
4:	Global variables
5:	Type definitions
6:	Enumerations
7:	Structures
8:	Command line parameters
9:	Header files
10:	The preprocessor
11:	NULL values
12:	Boolean values
13:	Nesting functions
14:	Conversion specifiers
15:	▶︎ Using quotes
16:	String length
17:	Returning strings
18:	Array length
19:	Looping through arrays
20:	Checking character values
21:	Printing percentage signs
22:	Troubleshooting: Implicit function declarations