Which STL class is the best fit for implementing a phonebook in C?

Which STL classes is best fit for implementing a phonebook?

For Phone Book Implementation You can use Unordered_map class of STL in C++.

Which choice is the correct declaration for a class named Dog?

Which choice is the correct declaration for the class named Dog, derived from the Animal class? Q34.

What is one benefit of declaring the parameter as a const reference instead of declaring it as a regular object?

The important difference is that when passing by const reference, no new object is created. In the function body, the parameter is effectively an alias for the object passed in. Because the reference is a const reference the function body cannot directly change the value of that object.

How do you implement phonebooks?

Phone Directory can be efficiently implemented using Trie Data Structure. We insert all the contacts into Trie. Generally search query on a Trie is to determine whether the string is present or not in the trie, but in this case we are asked to find all the strings with each prefix of ‘str’.

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What is a class template?

A class template provides a specification for generating classes based on parameters. Class templates are generally used to implement containers. A class template is instantiated by passing a given set of types to it as template arguments.

What is class polymorphism?

Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object. … In Java, all Java objects are polymorphic since any object will pass the IS-A test for their own type and for the class Object.

Which choice is not a difference between a class and a struct?

Structs are value types and are copied on assignment. Structs are value types while classes are reference types. Structs can be instantiated without using a new operator. A struct cannot inherit from another struct or class, and it cannot be the base of a class.

Does C++ support multiple inheritance?

C++ allows a special kind of inheritance known as multiple inheritance. While most object oriented languages support inheritance, not all of them support multiple inheritance. (Java is one such example). Multiple Inheritance simply means that a class can inherit properties from more than one base class.

What are the advantages of passing a vector by reference?

Advantages of passing by reference:

  • References allow a function to change the value of the argument, which is sometimes useful. …
  • Because a copy of the argument is not made, pass by reference is fast, even when used with large structs or classes.

Can const references be null?

A reference may never be null. An empty vector is still an object. It just doesn’t have anything in its container. You should be able to test whether this is the case using method calls on the vector.

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When an argument is passed by value?

When you pass an argument by value, you pass a copy of the value in memory. The function operates on the copy. This means that when a function changes the value of an argument passed by value, the effect is local to that function; the copy changes but the original value in memory is not affected.

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