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Spring
2016
Bca2030
1 What is a
variable? Write a program that accepts two numbers from the user and swaps the
two numbers without using a temporary variable.
Answer: The variable
is a name given to a particular location in the memory and the value stored in
a variable can be altered during program execution.
Program
to swap two numbers without using a temporary variable
# include
2 Differentiate
between While and Do-While loop.
Answer: While loop
Syntax:
while (condition expression)
{
Statement1;
3 Define
Function. Write a program to calculate nCr using function.
Answer: Functions
provide an easy means to organize the programs into smaller modules and use
them again without rewriting all the code. It enables reuse of program code.
Functions enable programmers to group program code under one name and invoke
them whenever required
4 What are the
advantages of Polymorphism? How it can be implemented?
Answer: Advantages of Polymorphism
1.) Code re-usability: Using the code
written somewhere in program.
Until C, Code re-usability can be
achieved using making it into an function. Then the function would be called
whenever it is needed. But in OOP, function is wrapped up into class. Required
code
5 How do you
define structure in C++. Write a C++ program that implements the structure and
enables to store at least 100 product data.
Answer: Structure is a
feature in C++ that enables you to define a user-defined datatype. Once you
specify the definition of the structure, you can create variables of that structure.
In the above definition, we have defined a structure using the keyword struct
followed by the name of the structure (
6 What is Class
in C++? Write a C++ program to implement class rectangle and find its area.
Answer: Classes provide users a method
to create user defined data types. We have seen two types of user defined data
type structures and enumeration in the previous unit. Both are
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