operators

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What's the difference between equal?, eql?, ===, and ==?

I am trying to understand the difference between these four methods. I know by default that == calls the method equal? which returns true when both operands refer to exactly the same object.[详细]

2023-03-30 04:08 分类：问答
Mysql Precedence Logic

Any explanation to the following queries : Select x FROM y WHERE a = 1 OR a = 2AND (b = 1 OR b = 2) why it doesn\'t return the correct info while this return the correct info :[详细]

2023-03-29 17:33 分类：问答
"in" operator fails even in a defined interval

I have a weird problem and I don\'t know where I am doing wrong. I have the following code. Please look at the end of it that\'s where it fails I commented it:[详细]

2023-03-29 15:43 分类：问答
unexpected behavior on casting

I have a doubt about how C++ casts types when it has to do math. The code below as it is ( i.e. with only the cast to int without casting to double ) works and builds without problem. If I define EN[详细]

2023-03-29 09:32 分类：问答
C++ Matrix Class with Operator Overloading

I was implementing a small dense matrix class and instead of plan get/set operators I wanted to use operator overloading to make the API more usable and coherent.[详细]

2023-03-29 01:08 分类：问答
groovy ^ operator

When given two boolean arguments, the ^ operator performs exclusive or, e.g. true ^ true == false true ^ false == true[详细]

2023-03-28 13:51 分类：问答
Why are my here-docs (<<-) giving me a syntax error?

methods() { cat <<-! start stop restart reload status methods ! } Is this correct I am getting error syntax error: unexp开发者_运维知识库ected end of file[详细]

2023-03-27 20:49 分类：问答
What is this PHP syntax with a caret called and what does it do?

I came across this syntax in a codebase and I can\'t find any more info on it. It looks like the caret operator (XOR operator), but because the statement below was executed when a certain condition wa[详细]

2023-03-27 16:53 分类：问答
Does the VBA "And" operator evaluate the second argument when the first is false?

Function Foo(thiscell As Range) As Boolean Foo = thiscell.hasFormula And (InStr(1, UCase(Split(th开发者_Python百科iscell.formula, Chr(40))(0)), \"bar\") > 0)[详细]

2023-03-27 08:22 分类：问答
RadioInfo.getCurrentNetworkName() giving a null value?

I am using RadioInfo.getCurrentNetworkName() to get the operator name in the blackberry device. It is working fine since now when I noticed that for a given device, this function is returning a null v[详细]

2023-03-26 22:39 分类：问答