The process of selecting the most appropriate method from a set of overloaded methods is called 'Method Resolution' or 'Function Resolution.' This is determined by the number and types of arguments in the function call. It's a crucial concept in polymorphism and method overloading in C++.

The while loop in C++ tests the condition before executing its body. It's a pre-test loop, meaning that it evaluates the condition first, and if it's true, it enters the loop body. This loop is suitable when you want to execute a block of code as long as a condition is true initially.

The inline keyword is used before a function in C++ to make it an inline function. An inline function is a request to the compiler to insert the code of the function at the calling point instead of performing a normal function call. This can improve performance in certain situations by reducing the overhead of function calls.

In scenarios where a loop's execution depends on an external condition, the while loop is most appropriate. It evaluates the condition before each iteration, allowing you to control the loop based on changing external conditions.

The "==" operator in C++ is the equality operator, and it is used to check if two operands are equal. It returns true if the operands are equal and false otherwise. This operator is frequently used in conditional statements and comparisons in C++ programs.

In C++, the string data type is used to store a sequence of characters, such as words or sentences. It provides convenient methods for working with text data, unlike other data types like char or int.

When an inline function is too long or complex, it can lead to increased code size. This is because the function's code is inserted at each call site, potentially resulting in larger compiled code. However, this may be offset by improved performance due to reduced function call overhead.

In C++, when a return type is not explicitly provided for a function, it defaults to 'void.' This means the function does not return a value. It's essential when you have functions that perform actions without returning a result, such as void functions for input/output or setting variables.

Functions in C++ can return multiple values using tuples. A tuple is an ordered collection of elements, and it's an excellent way to return multiple values from a function. It's more flexible than returning values using pointers, references, or arrays, as it allows you to return values of different types. Tuples were introduced in C++11.

In C++, the 'typedef' keyword is used to define user-defined data types. It allows you to create aliases for existing data types, making your code more readable and maintainable.