Can someone explain why is this not valid? I get "can't convert to int to bool"
if (b & 1)
also, why can't I do
b & 1
in code, is this the correct way of doing this?
int b = b & 1
if(b)
Thanks!
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1 Answer
It's because the result of b & 1 is an integer (if b is an integer).
A correct way to do this is (among others):
if ((b & 1) != 0) { ... }
or
if (Convert.ToBoolean(b & 1)) { ... }
5 Comments
Dave Markle
Note that your third example will also fail for this reason. You'd have to convert "b" to an integer or compare it with 0, since
if can only compare boolean expressions.
Kristian
so if I want to do a regular bit operation like this somewhere in the code (b&8) like I would in javascript, c# I would have to write b = b & 2; correct?
Dave Markle
No, you don't need to store the result in a variable (seem my first example); you just need to understand that the result will be strongly-typed as an integer, and that you will have to convert it or compare it to another integer. Note that C# doesn't consider 0 to be "false" like C or JS does. In my first example, I'm literally comparing the integer output of b & 1 to the number 0.
Kristian
when if(b & 1) gets executed, does the b value get updated and will differ after if stamement or it works the same way as if(a-1>3) where a stays the same after the if statement, not like a = a -1; if that makes sense
Dave Markle
In both of your examples, both "a" and "b" never change. As I said, just the expression
if (b & 1) is illegal, since b & 1 is not a boolean expression, so your question doesn't really make any sense... The expression if(b & 1) is equivalent to c = b & 1; if (c).