equals

Possible Duplicate: php == vs === operator An easy answer for someone I'm sure. Can someone explain why this expression evaluates to true? (1234 == '1234 test') Lucas Green Because you are using the == (similarity) operator and PHP is coercing the string to an int. To resolve it use the === (equality) operator, which checks not only if the value is the same, but also if the data type is the same, so "123" string and 123 int won't be considered equal. In PHP (and JavaScript -- which has slightly different behavior), the comparison operator == works differently than it does in strongly-typed

EDIT Thanks for the prompt responses. Please see what the real question is. I have made it bold this time. I do understand the difference between == and .equals. So, that's not my question (I actually added some context for that) I'm performing the validation below for empty strings: if( "" == value ) { // is empty string } In the past when fetching values from the db or deserializing objects from another node, this test failed , because the two string instances were indeed different object references, albeit they contained the same data. So the fix for those situations was if( "".equals(

The following code in C# doesn't work: int iValue = 0; double dValue = 0.0; bool isEqual = iValue.Equals(dValue); So, the question: what's the best way to compare Double and Int? LBushkin You really can't compare floating point and integral values in a naive way; particularly, since there's the classic floating point representation challenges . What you can do is subtract one from the other and see if the difference between them is less than some precision you care about, like so: int iValue = 0; double dValue = 0.0; var diff = Math.Abs(dvalue - iValue); if( diff < 0.0000001 ) // need some min

Possible Duplicate: What makes reference comparison (==) work for some strings in Java? I know this has been asked before , but in spite of recommendations to use .equals() instead of the == comparison operator, I found that == works all the time: String s1 = "Hello"; String s2 = "Hello"; System.out.println(s1 == s2); // true Can anyone give me an example of the == operator failing? This is because you're lucky. The == operator in Java checks for reference equality : it returns true if the pointers are the same. It does not check for contents equality. Identical strings found at compile-time

The VS2005 documentation Guidelines for Overloading Equals() and Operator == (C# Programming Guide) states in part Overriding operator == in non-immutable types is not recommended. The newer .NET Framework 4 documentation Guidelines for Implementing Equals and the Equality Operator (==) omits that statement, although one post in Community Content repeats the assertion and references the older documentation. It seems that it is reasonable to override Equals() at least for some trivial mutable classes, such as public class ImaginaryNumber { public double RealPart { get; set; } public double