How Do Combinations of ¦¦ and && Work?

[Luckygold6]

What order do they work in. For example, if I entered the following code, how will it execute?

if (arArray[iC][1] == 0 || arArray[1][iB] == 0 && iC < 5 && iB < 5)

When it reads the code, does it read it as:
1. arArray[iC][1] == 0 or arArray[1][iB] == 0 must hold true and iC < 5 and iC < 5 both must hold true.
or as:
2. arArray[iC][1] == 0 or arArray[1][iB] == 0 and iC < 5 and iB < 5 must hold true.

I can't seem to figure out which logic path the computer would take. Can someone please help clarify this.

Thanks in advance.

 

[LazyMe]

The computer takes the same logic as we learned at school.
If the operators are of same importance (like || and &&) it reads from left to right.
Greetings,
Rick

 

[areza123]

The operator precedence is
1.Boolean operators &&, ||, !
2.Arithmetic operators +, -, *, /, %
3.Equality operators <, >, ==, <=, >=, !=
4.Assignment operators =, +=, -=, *=, /=, %=

1.Highest precedence
4.Lowest precedence

 

[Zyrenthian]

Areza is correct but it is a bit difficult to follow

&& has a higher precedence then || so
if arArray[iC][1] == 0 || arArray[1][iB] == 0 && iC < 5 && iB < 5)

arArray[1][iB] == 0 && iC < 5 && iB < 5 is evaluated first and if either that is true OR arArray[ic][1] == 0 you will get into the if. Remember parens will be your best friend if you want to control how this is done.


Matt

 

[lionelhill]

Absolutely! Extra parentheses don't hurt your code performance one jot, but they really really aid unambiguity and readability!

 

[Luckygold6]

Wow... thank guys.

I never knew parentheses could be used in those areas of th code!