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C++ Interview questions based on constructors/ Destructors
C++ interview questions on ConstructorsWhat is a constructor?A constructor is a function of a class that has the same name as the class. The constructor is called at the time of the initialization of object. There are three types of constructors −Default constructorParameterized constructorCopy constructorSyntaxclass cl_name{ cl_name(){ //This is constructor.. } }What is a destructor?A destructor is a method of a class that has the same name as the class preceded by a tild ~ symbol. It is called at the end of code or when the object is destroyed or goes out of scope.Syntaxclass ...
Read MoreC++ vs C#
C++ Programming languageA successor of the c programming language that has introduced the concept of classes and objects. It encapsulates features of c and high-level language hence it can be treated as an intermediate-level language. When it was created it was thought of as a C that has classes because of its similarities with C.C# Programming LanguageC# (also known as C sharp) is a general-purpose programming language that was developed by Microsoft to run on .net framework for developing applications for its operating system. It is an object-oriented programming language with features like object-oriented, statically typed, decorative, multiparadigm programming language.Both ...
Read MoreC++ program to print unique words in a file
A file is a memory location that stores word streams. In a file, there are various words. In this program, we will find all unique words from the file and print them.A unique word means the number of occurrences of the word is one in the file.For example, Tutorials point is best for programming tutorials.Here, the word tutorial occurs more than once, hence it is not unique. Rest all words are unique.AlgorithmTo check for unique words in the given file. Using iterator with two variables : data and occurence. Input : File Step 1 : Read each line from the ...
Read MoreC++ map having key as a user defined data type
A map is a data structure that stores information in the form of key and value pairs. In C++, map is defined in STL (standard template library) and store keys in an ordered form.Syntax to define a map −map map_name;The data type of any of these two data of the map can be any of the data types. We can have any of the primary data types or derived data types as key or value data types in a map.We can use any of the data types as the data type of the key of the map. Even a user-defined ...
Read MoreC++ interview questions on virtual function and abstract class
What is a virtual function?A virtual function is a method that does not have a definition when defined in the base class. This method is left black in the parent class and it is redefined in the child class.What is an abstract class?An abstract class is a class that has abstract members or at least one pure virtual function in its definition. An abstract class can never be instanced (creating an object). It can only be inherited and the methods could be overwritten.Can there be any virtual Destructors?Yes, These are legal in C++, but these are destructors are for base ...
Read MoreDifference between print() and println() in Java
As we know in Java these both methods are primarily used to display text from code to console. Both these methods are of PrintStream class and are called on static member 'out' of 'System' class which is a final type class.The following are the important differences between print() and println().Sr. No.Keyprint()println()1Implementationprint method is implemented as it prints the text on the console and the cursor remains at the end of the text at the console.On the other hand, println method is implemented as prints the text on the console and the cursor remains at the start of the next line ...
Read MoreDifference between length of Array and size of ArrayList in Java
In collections, one of the main functional requirement is to get the number of elements which are get stored in our collection so that one can decide whether to put more elements in it or not. Also, the number of elements is also required for iteration of collection.As we know Array and Arraylist both are used to store elements but both have different defined methods in order to know the number of elements stored in it.The array has a length method that provides the number of elements can be stored or in simple words capacity of the Array. Also, the ...
Read MoreDifference between Arrays and Collection in Java
In order to store multiple values or objects of the same type, Java provides two types of data structures namely Array and Collection.The following are the important differences between Arrays and Collection.Sr. No.KeyArraysCollection1SizeArrays are fixed in size i.e once the array with the specific size is declared then we can't alter its size afterward.The collection is dynamic in size i.e based on requirement size could be get altered even after its declaration.2Memory ConsumptionArrays due to fast execution consumes more memory and has better performance.Collections, on the other hand, consume less memory but also have low performance as compared to Arrays.3Data ...
Read MoreHow to write data to .csv file in Java?
A library named OpenCSV provides API’s to read and write data from/into a.CSV file. Here it is explained how to write the contents of a .csv file using a Java program.Maven dependency com.opencsv opencsv 4.4 org.apache.commons commons-lang3 3.9 The CSVWriter class of the com.opencsv package represents a simple csv writer. While instantiating this class you need to pass a Writer object representing the file, to which you want to write the data, as a parameter to its constructor.It provides methods named writeAll() and writeNext() to write data to a .csv file.Using the ...
Read MoreHow to read data from .csv file in Java?
A library named OpenCSV provides API’s to read and write data from/into a.CSV file. Here it is explained how to read the contents of a .csv file using a Java program.Maven dependency com.opencsv opencsv 4.4 org.apache.commons commons-lang3 3.9 The CSVReader class of the com.opencsv package represents a simple CSV reader. While instantiating this class you need to pass a Reader object representing the file to be read as a parameter to its constructor. It provides methods named readAll() and readNext() to read the contents of a .csv fileUsing the readNext() methodThe readNext() ...
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