boolean

问题 I have a SSRS report that works with boolean parameter. I would like to add a third option to show all the records on the report. Both true and false. The concept is that the dropdown will include three options (All,True,False). Is there a way to acheive that? Thanks, -Y 回答1: Set the dataset filter to something like this: I have 3 available values for @parmTRUEFALSE False = False True = True All Records = (Null) =IIF(IsNothing(Parameters!parmTRUEFALSE.Value), ObjectFieldName.Value, Parameters

问题 I'm trying to get a boolean value from SharedPreferences that is true but I'm getting a false value every time. The SharedPreferences file named "MyPref"contains the following code: <?xml version='1.0' encoding='utf-8' standalone='yes' ?> <map> <boolean name="PREMIUM" value="true" /> </map> I'm adding values to SharedPreferences in MyActivity.class using the following code: SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 1); // 0 - for private mode Editor

问题 This question already has answers here : Casting int to bool in C/C++ (3 answers) Closed 3 months ago . From some reading on Stack Overflow, I gather that bool , as defined in stdbool.h , is a macro that expands to the built-in type _Bool , and that true is defined as 1 and false is defined as 0 . Is casting to bool guaranteed to return a value of 0 or 1 ? Might a _Bool variable, including cast rvalues, ever attain a value other than 0 or 1? The following code implies that _Bool variables,

问题 This question already has answers here : Casting int to bool in C/C++ (3 answers) Closed 3 months ago . From some reading on Stack Overflow, I gather that bool , as defined in stdbool.h , is a macro that expands to the built-in type _Bool , and that true is defined as 1 and false is defined as 0 . Is casting to bool guaranteed to return a value of 0 or 1 ? Might a _Bool variable, including cast rvalues, ever attain a value other than 0 or 1? The following code implies that _Bool variables,

问题 I am new to JDBC and have been playing with it. Other posts in the forum indicate that Oracle's JDBC driver does not support Oracle PLSQL Boolean type. I find that really strange: From the oracle jdbc documentation it seems like it does: But in another section it says it does not allow passing of BOOLEAN parameters to PL/SQL stored procedures. Isn't the the documentation contradicting itself ? It does not let me pass or accept Boolean values from PL/SQL procedures/functions. It gives me the

问题 I am new to JDBC and have been playing with it. Other posts in the forum indicate that Oracle's JDBC driver does not support Oracle PLSQL Boolean type. I find that really strange: From the oracle jdbc documentation it seems like it does: But in another section it says it does not allow passing of BOOLEAN parameters to PL/SQL stored procedures. Isn't the the documentation contradicting itself ? It does not let me pass or accept Boolean values from PL/SQL procedures/functions. It gives me the

问题 When i convert: int B=1; boolean A=B; It gives error: Incompatible types, which is true But when I write this code: int C=0; boolean A=C==1; it gives false while if I change value of C to 1 it gives true. I don't understand how compiler is doing it. 回答1: int C=0; boolean A=C==1; The compiler first gives C a zero. Variable : C Value : 0 Now The Assignment statement, We know that the assignment statement evaluates the right part first and the gives it to the left. The right part ==> C == 1 Here

问题 In PHP, is if(!$foo) equivalent with if($foo != true) or with if($foo !== true) or is it even something completly different of both? 回答1: if(!$foo) is the equivalent to if($foo != true) so $foo = null; if(!$foo){ echo "asd"; } will ouptut "asd" 回答2: Note that, == OR != compares the values of variables for equality, type casting as necessary. === OR !== checks if the two variables are of the same type AND have the same value. This answer will give you better explanation of this concept: https:

问题 What does this statement mean? isChecked = isChecked ^ 1; isChecked is a BOOL . 回答1: it will XOR isChecked with 1 so I suppose true ^ 1 = 0(false) and false ^1 = 1(true) 回答2: The "^" is an exclusive OR operation, so 0 flips to 1, and 1 flips to zero. The result should be the same as isChecked = !isChecked . 回答3: It only flips the last bit of BOOL . Not a reliable way to logically negate. If someone is crazy enough to set the a BOOL variable to some number, for example 5. Then doing ^ 1 will

问题 I would like to take a bool from a Vec<bool> and compare it in an if statement. How do I solve the following error? | 7 | if cell { | ^^^^ expected bool, found &bool | = note: expected type `bool` found type `&bool` if cell.clone() works for me but seems a bit hackisch. 回答1: take a bool from a Vec<bool> Just do that: let foo = vec![true]; if foo[0] { /* ... */ } bool implements Copy, so indexing the array will copy the value out. If you had a reference to the boolean inside the vector, you