and verses &&

Using Arduino Programming Questions
#1

Thank you for reading this.

What is correct? if(A<=0 && A>100){} or if(A<=0 and A>100){}

I am having trouble understanding boolean operators…

#2

C++ has added 'and' as an alias of &&, so either is correct. These are the logical operators they work on the variable as a whole. '&' and 'bitand' are the bitwise operators, they work on individual bits in the variable.

#3

Logical AND is done with the && operator:

  • if (A < MAX && B > MIN)*

Your sample expression seems unlikely since it asks: “If A is negative and A is greater than 100”. Clearly, the same variable cannot be negative and greater than 100 at the same instant. While C++ supports “and” most Arduino programmers use the logical AND operator.

#4

They are the same

C++ defines and which is similar to &&

C++ also has and_eq which is the bitwise and, similar to &=

There is a full list of alternative operator representation

&& → and
&= → and_eq
& → bitand
| → bitor
~ → compl
! → not
!= → not_eq
|| → or
|= → or_eq
^ → xor
^= → xor_eq

see http://en.cppreference.com/w/cpp/language/operator_alternative

There is also on that link the little known digraphs and trigraphs for replacing characters that might not be on some keyboards like replacing { with <% or ??<

Fun to know !

#5

J-M-L:
There is also on that link the little known digraphs and trigraphs for replacing characters that might not be on some keyboards like replacing { with <% or ??<

Sounds like the foundation of another obfuscated C contest.

#6

MorganS:
Sounds like the foundation of another obfuscated C contest.

Yes !!!

#7

thank you everyone

#8