Answer to Question #25865 in C++ for anand tripathi

Question

why we need to specify data type of all the veriables in the argument list of a function defnition

Answer 1

Because, if we would define functions without & specify data type of all the variables in the argument list& of a function defnition, we could not make such a thing as function overload!

Function overloading or method overloading is a feature found in various programming languages such as Ada, C++, C#, D, and Java, that allows creating several methods with the same name which differ from each other in the type of the input and the output of the function. It is simply defined as the ability of one function to perform different tasks.
For example, doTask() and doTask(object O) are overloaded methods. To call the latter, an object must be passed as a parameter, whereas the former does not require a parameter, and is called with an empty parameter field. A common error would be to assign a default value to the object in the second method, which would result in an ambiguous call error, as the compiler wouldn't know which of the two methods to use.