String and Character Constants

String and character constants are very different. Strings are surrounded by double quotes (") and

characters by single quotes ('). So "X" is a one-character string, while 'Y' is just a single character.

The string "X" takes up two bytes, one for the X and one for the end-of-string (\0). The character 'Y' takes up one byte.

Source: Practical C Programming, Third Edition - O'Reilly Media