Mark meaing in arduino

Projects Programming
1

Hello mates
what does ' ' means in Arduino
example:
if ((c >='0') && (c <= '9')) {
v = 10 * v + c - '0';
}
I mean what is the effect of these marks on the code is

2

Welcome to the forum

'0' is a single character representing a zero. Not to be confused with "0" which is a string containing a single character representing a zero

' ' (2 single quotes) is used only for single characters so '123' would not be valid but "123" would be

Note that in the code that you posted c is a character not an integer so you cannot test whether its value is between 0 and 9, for instance, but you can test whether its value is between '0' and '9' as in the code

3

thanks bro

4

As this has nothing to do with Avrdude, stk500, Bootloader issues, your topic has been moved to a more suitable location on the forum.