Chapter 11, Problem 1PP

a)

Program Plan Intro

To construct the class Pol_coord along with the member functions convToPolar() and showdata().

Explanation of Solution

//class definition
classPol_coord
{
//two floating point data members dist and mathematical
    private:
floatdist;
float theta;

//constructor and function prototypes
    public:
Pol_coord();
voidshowdata();
voidconvToPolar(float,float);

};

//constructor function
Pol_coord::Pol_coord()
{
//setting the values to 0
dist=0;
    theta=0;
}

//function for finding the polar coordinates
voidPol_coord::convToPolar(float x,float y)
{
dist=sqrt(pow(x,2)+pow(y,2));
    theta=(atan(y/x)*(180/3.1416));
}

//function for showing the data
voidPol_coord::showdata()
{
cout<<"The polar coordinates are ";
cout<<dist<<", "<<theta<<endl;
return;
}

Explanation:

Create the class Pol_coordwith two floating data members for distance and angle. The constructor is used for assigning these two values.The function convToPolar() is used for converting them into polar coordinates using the following formula:

dist=sqrt(pow(x,2)+pow(y,2));
   theta=(atan(y/x)*(180/3.1416));

b)

Program Plan Intro

Program Plan:

• Include the class declaration and implementation in the program.
• Create the objects of the class Pol_coordin the main function.
• Calculate the polar coordinates using the method convToPolar.
• Display the data member values using the function showValues.

Program Description: The purpose of the program is to find the polar coordinate values.

Explanation of Solution

Program:

#include<iostream>
//including the header file for mathematical functions
#include<cmath>
usingnamespacestd;
//class definition
classPol_coord
{
//two floating point data members dist and mathematical
    private:
floatdist;
float theta;

//constructor and function prototypes
    public:
Pol_coord();
voidshowdata();
voidconvToPolar(float,float);

};

//constructor function
Pol_coord::Pol_coord()
{
//setting the values to 0
dist=0;
    theta=0;
}

//function for finding the polar coordinates
voidPol_coord::convToPolar(float x,float y)
{
dist=sqrt(pow(x,2)+pow(y,2));
    theta=(atan(y/x)*(180/3.1416));
}

//function for showing the data
voidPol_coord::showdata()
{
cout<<"The polar coordinates are ";
cout<<dist<<", "<<theta<<endl;
return;
}

intmain()
{
Pol_coord a;
a.convToPolar(9.09326,5.25001);
a.showdata();
return0;
}

Explanation:

The object of the class Pol_coord is created and the function convToPolar ( float, float ) is called with float values and then function showdata() is called for displaying the polar coordinates in the output screen.

Output Screenshot: