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course CODE & NAME DCA1203-Object Oriented Programming – C++






  1. Describe the various data types available in C++?


Data types

A data type in a programming language is a set of data with values having predefined characteristics. Like C language, C++ also supports different data types. C++ language supports the following data types: char, int, float, double. The basic data types have various modifiers preceding them.


The list of modifiers is: signed, unsigned, long and short.

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  1. What is the difference between the do-while and the while statements?

Ans: The primary difference between do-while and while statements in programming lies in when the condition is evaluated and how many times the loop’s body is guaranteed to execute.


Here are the key differences and some example code snippets to illustrate: 


While Statement Condition Evaluation: The condition is evaluated before the loop body is executed.




  1. Brief about class and objects.

Ans: Classes and Objects in Object-Oriented Programming (OOP) Class


A class is a blueprint or template for creating objects. It defines a set of attributes and methods that the created objects will have. A class encapsulates data for the object and methods to manipulate that data. Essentially, it represents a real-world entity or concept.


Key Characteristics of a Class: 


Attributes (Fields): Variables that hold the data or properties of an object.








  1. Define exception. Explain exception handling mechanism.


Exception Handling Mechanism


The exception handling mechanism in C++ is built upon the three keywords named as try, throw and catch. The block of statements which generates exceptions are prefaced by the “try” keyword. These blocks of statements are called “try block”. When, an exception is detected, it is thrown using a throw statement in the try block. A “catch block” defined by the keyword “catch” catches the exception thrown by the throw statement in the try block, and handles it


throwing exception


  1. List and explain the STL components.


STL Components


There are many components present in STL. But there are three major components in STL namely:


  • Containers


  • Algorithms


  1. Explain the types of methods to open a file.


Opening a file For opening a file you have to create a file stream and link it to a filename. You can define a filename using if stream, of stream and fstream classes. These classes are contained in the header file fstream. Selection of classes which you are going to use depends on the purpose, i.e., whether you want to write data to the files or to read data from the files. There are two ways