write one complete c++ program to calculate the circumference (c=2PIr) of a circ

Question

write one complete c++ program to calculate the circumference (c=2PIr) of a circle and the area (a =PIr^2 ) of a circle. the radius should be entered from a input file an PI should be set up as a constant in the program. the radius, area, and circumference will be stored on an output file with headings. you do not have to include the 2 columns of information at the top of the program or the program description. however, do include any processor commands ( like include, etc). this program should include at leady 4 functions: reafFileData, PrintFileData, cakcArea and call circumference. Use your own end of file pricessing- a trailer of -1, a count in front of the data on the file, ora test for fin.eof().

Explanation / Answer

radiusdata.txt (Save this file under D Drive.Then the path of the file pointing to it is D: adiusdata,txt)

5.5
4.0
6.5
7.0
3.4
2.5
-1

______________

#include <fstream>
#include <iostream>
#include <iomanip>
#define PI 1.41459
using namespace std;

//Function Declarations
double * readFileData(ifstream& dataIn,double rad[]);
void printFileData(ofstream& dataOut,double rad[],int size);
double calArea(double radius);
double calCircum(double radius);

int main() {

//Declaring variables
double radius;
int count=0;  
//defines an input stream for the data file  
ifstream dataIn;
  
//Defines an output stream for the data file
ofstream dataOut;
  
//Opening the input file
dataIn.open("D: adiusData.txt");
if(dataIn.fail())
{
   cout<<"** File not found **"<<endl;
   return 1;
}
else
{
   //This loop will counts the no of records in the inputfile
   while(dataIn>>radius)
   {
       if(radius!=-1)
       {
           count++;
       }
   }
   dataIn.close();
  
   //creating an double arra based on count
   double rad[count];
  
   //calling the function to read the data
   readFileData(dataIn,rad);
     
   //calling the function to display the data
   printFileData(dataOut,rad,count);
}
  
  
return 0;
}

//this function will read the data from the file
double * readFileData(ifstream& dataIn,double rad[])
{
   //Declaring variables
   double radius;
  
   //Opening the input file
   dataIn.open("D: adiusData.txt");
   int i=0;
  
   //reading the data till the end of the file
   while(!dataIn.eof())
   {
       //Populating the radius values into an array
       dataIn>>radius;
       if(radius!=-1)
       {
           rad[i]=radius;
           i++;
       }
   }
  
   //Closing the input stream
   dataIn.close();
   return rad;
}

//This function will write the data to output file
void printFileData(ofstream& dataOut,double rad[],int size)
{
   //creating and Opening the output file
dataOut.open("D:\circleData.txt");
  
//Setting the precision to two decimal places
dataOut << std::setprecision(2) << std::fixed;

/* This for loop will calculate the area
* , circumference of circle and
* write that data to the output file
*/
   for(int i=0;i<size;i++)
   {
       dataOut<<"Radius"<<endl;
       dataOut<<"------"<<endl;
       dataOut<<rad[i]<<endl;
       dataOut<<"Area Of Circle"<<endl;
       dataOut<<"--------------"<<endl;
       dataOut<<calArea(rad[i])<<endl;
       dataOut<<"Circumference Of Circle"<<endl;
       dataOut<<"--------------"<<endl;
       dataOut<<calCircum(rad[i])<<endl;
       dataOut<<endl;
      
   }
   dataOut.close();
}

//This function will calculate the area of the circle
double calArea(double radius)
{
   return PI*radius*radius;
}

//This function will calculate the circumference of the circle
double calCircum(double radius)
{
   return 2*PI*radius;
}

_____________________

Output:

circleData.txt (We can See this file under D Drive.As we specified the path of the output file as D:\circleData.txt)

Radius
------
5.50
Area Of Circle
--------------
42.79
Circumference Of Circle
--------------
15.56

Radius
------
4.00
Area Of Circle
--------------
22.63
Circumference Of Circle
--------------
11.32

Radius
------
6.50
Area Of Circle
--------------
59.77
Circumference Of Circle
--------------
18.39

Radius
------
7.00
Area Of Circle
--------------
69.31
Circumference Of Circle
--------------
19.80

Radius
------
3.40
Area Of Circle
--------------
16.35
Circumference Of Circle
--------------
9.62

Radius
------
2.50
Area Of Circle
--------------
8.84
Circumference Of Circle
--------------
7.07

____________________Thank You

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