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Arrays in C++ Passing Arrays to Functions

As well as a logical AND, it additionally serves as the bitwise operator of an intersection between elements. In the 20th century, following the development of formal logic, the ampersand became a commonly dumb in asl used logical notation for the binary operator or sentential connective AND. Sign at the end of the alphabet as if it were the 27th letter, pronounced as the Latin et or later in English as and.

This is highly counter-intuitive and opposite to how most other languages work. If you try to pass the lvalue to the function, you will get an error. So basically, the primary purpose of the double ampersand is to refer to rvalues. “L” stands for left in lvalue reference and “R” stands for right in rvalue reference.The thing to remember is that these are properties of expressions and not objects. Briefly, if type deduction takes place, you declare a universal reference, if not an rvalue reference. Rvalues are defined by exclusion, by saying that every expression is either an lvalue or an rvalue.

The copy constructor creates a copy of the input DigitalInput. The ampersand tells the compiler that the function will be working with the original array , not with a temporary copy. The use of the ampersand prevents unnecessary copying of the array and allows the function to deal directly with the original array.

The first run should show memory address; the second will be 10 and 20. Mychar, as one would expect, would contain the value 1001. But not so obviously, myshort would contain the value 2002, and mylong would contain 3004, even though they have each been incremented only once.

Ampersand is the string concatenation operator in many BASIC dialects, AppleScript, Lingo, HyperTalk, and FileMaker. In Ada it applies to all one-dimensional arrays, not just strings. In most situations, the function will need to know the size of the array it is accessing. By allowing the function to determine the length of the array , the function will be written in a more generic form and can be repeatedly used for arrays of varying sizes. If your function will not be changing any elements in the array, it is possible to guarantee that no changes occur by adding the word const.