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The ?? double question mark operator means "if null". Take the following expression, for example. Take the following expression, for example. String a = b ?? 'hello';. In C#, two question marks together (??) represent the null-coalescing operator. The null-coalescing operator is used to provide a concise way to handle null values and perform a fallback action or provide a default value when a nullable expression evaluates to null. It is particularly useful for handling null reference exceptions and.

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How to Use Question Marks in Spanish 11 steps

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Section B (50 marks) Answer any two questions from this section. All questions carry equal marks

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The Equals method should be used with caution, because two apparently equivalent values can be unequal due to the differing precision of the two values. The following example reports that the Double value .3333 and the Double returned by dividing 1 by 3 are unequal. object double2 = (double) 1/3;. Single Question Mark Overview. We are no strangers to the use of the single question mark operator, in almost any programming language: The condition is evaluated and if it is true a value is.