Hi Dave,
"Dave" wrote:
got my answer, Thanks
in C# if you type & it is bit AND operator, it returs int, that is the
reason why the compiler generated error.
In order to get boolean AND comparison you have to write &&
if(checkLogin && 1)
{ }
--
Vadym Stetsyak aka Vadmyst
&& is the logical and, and for x being a bool value, the expression
x && true
equals
x
The expression
x && 1
with x being an int is an invalid expression because operator && takes two
bools as its operands.
I've read VB.NET code once, and what they did with the logical operators and
bit-wise operators is just plain ugly and counter-intuative. I've never been
a VB fan though.
Anyway,
operator &: bit-wise AND
operator &&: logical AND
operator |: bit-wise OR
operator ||: logical OR
The bit-wise operators can take any integer value type (short, int, long
....), while the logical operators take bool as operands.
For instance:
15 & 4 yields 4
true && false yields false
11 | 4 yields 15
true || false yields true
Note however that the logical operators && and || are short-circuiting. An
explanation:
For the logical && operator. If in the expression
x && y
statement x yields false, then statement y is not executed since "false &&
y" yields false. For instance in the expression
f( ) && g( )
if method f returns false, method g is not executed and the result of the
expression is false.
For the logical || operator. If in the expression
x || y
statement x yields true, then statement y is not executed since "true || y"
yields true. For instance in the expression
f( ) || g( )
if method f returns true, method g is not executed and the result of the
expression is true.
Kind regards,
--
Tom Tempelaere.
