IN C++ LANGUAGE PLEASE Creating a Namespace To place some program in a namespace, simply include the program in the name

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IN C++ LANGUAGE PLEASE
Creating a Namespace
To place some program in a namespace, simply include the program in
the namespace grouping:
namespace Name_Space_Name
{
The_Program
}
To make a program defined in this namespace available to your
programs, use using directive:
using namespace Name_Space_Name;
To illustrate this let's look at the following program.
// P92.cpp - This program illustrates the use of namespaces
#include<iostream>
using namespace std;
namespace cm
{
double area(double length, double width);
}
namespace meter
{
double area(double length, double width);
}
double area_km(double length, double width);
int main ( )
{
double length, width; // dimension of a rectangle
double A; // area of a rectangle
cout << "Enter the length and the width of the rectangle.
\n";
cout << "Assuming unit is meter \n";
cin >> length >> width;
{
using namespace cm;
A = area(length, width);
cout << "Area is: " << A << endl;
}
{
using namespace meter;
A = area(length, width);
cout << "Area is: " << A << endl;
}
A = area_km(length, width);
cout << "Area is: " << A << endl;
return 0;
}
namespace cm
{
double area(double length, double width)
{
cout << "From namespace cm, I am sending area in cm^2
back\n";
return (length*100)*(width*100);
}
}
namespace meter
{
double area(double length, double width)
{
cout << "From namespace meter, I am sending area in m^2
back\n";
return length*width;
}
}
double area_km(double length, double width)
{
cout << "From std namespace, I am sending area in km^2
back\n";
return (length/1000)*(width/1000);
}
In the above program we have asked the user to input the length
and width of a rectangle in meters. Then, we have used different
name spaces to compute the area of THE rectangle using three
different units. As you have noticed, the program that computes the
area in namespace cm and meter are both called area, but they
perform different computations depending on their definitions in
their respective namespace.
Exercise 9.2 (ANSWER THIS)
A student has found a summer job in a painting company. He is to
estimate the amount of paint
that the company needs to paint rectangular fields of different
sizes. On average,
a) 0.2 kg (kilogram) of paint is needed to paint a one
square meter area (0.2 kg/m2).
b) 22 mg (milligram) of paint is needed to paint a one square
centimetres area (22 mg/cm2).
c) 19.6 T (Ton) of paint is needed to paint a one square km area
(19.6 T/km2)
Use the above program to estimate the amount of paint required
to paint a rectangle with the length and width that the user will
enter from the keyboard. You need to compute the amount of paint in
three different units (kg, mg, and Ton).