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Answers to a recent post (Any chances to imitate times() Ruby method in C#?) use the => operator in the usage examples. What does this operator do? I can't locate it in my C# book, and it is hard to search for symbols like this online. (I couldn't find it.)
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%d is a format specifier, used in C Language. Now a format specifier is indicated by a % (percentage symbol) before the letter describing it. In simple words, a format specifier tells us the type of data to store and print. Now, %d represents the signed decimal integer.
The && (logical AND) operator indicates whether both operands are true. If both operands have nonzero values, the result has the value 1 . Otherwise, the result has the value 0 . The type of the result is int . Both operands must have an arithmetic or pointer type.
C language supports a rich set of built-in operators. An operator is a special symbol that tells the compiler to perform specific mathematical or logical operations. Operators in programming languages are taken from mathematics.
Less than or equal to operator is a logical operator that is used to compare two numbers.
It's not really an operator as such, it's part of the syntax for lambda expressions. In particular => is the bit which separates the parameters from the body of the lambda expression.
Does your book cover C# 3.0? If not, it won't include lambda expressions. If it does, it should really cover them! Hopefully with the right terminology, you'll be able to find it in the TOC or index.
EDIT: A bit more information: A lambda expression is a piece of syntactic sugar to either create an instance of a delegate or an expression tree (the latter being new to .NET 3.5). Lambda expressions almost entirely replace anonymous methods (from C# 2.0) although they don't support the notion of "I don't care about the parameters" in the way that anonymous methods do.
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