Differences between single-quotes and double-quotes in C

Question

Recentely I have seen that if I use printf with \'foo\' I get a warning.

printf(\'numero\');

warning: character con

Answer 1

In c, ' is used for character constants, where as " is used for a string

The printf function in c needs a string, so your code printf('numero'); will result an unexpected behavior.

Instead, use printf("numero");

You can read this small tutorial for more help