write a c++ program that asks the user for a radius r. The program must include

Question

write a c++ program that asks the user for a radius r. The program must include a function called calcwradius that accepts the value of the radius r, and calls the function pi shown below

double pi()
{
return (2.0 * asin(1.0);
}
then calculates and passes the following three values back to the main function:
1. volume = (4/3) pi r^3
2. area = pi r^2
3. circum =2 pi r
the main function will then print these values to the screen. You must include the function pi() and the prototypes for pi and clacwradius in your program.

Explanation / Answer

#include <iostream>
#include <iomanip>
#include <math.h>

using namespace std;

//PROTOTYPES
void calcwradius(double, double &, double &, double &);

int main()
{
   //LOCAL DECLARATIONS
   double radius;
   double volume;
   double area;
   double circum;

   cout << "Enter radius: ";
   cin >> radius;

   calcwradius(radius, volume, area, circum);

   cout << endl << fixed << setprecision(3)
        << "Volume: " << volume << endl
        << "Area: " << area << endl
        << "Circumference: " << circum << endl;

   cout << endl;
   return 0;
}

//---------------------------------------------------------
// FUNCTION DEFINITIONS
//---------------------------------------------------------
double pi()
{
   return 2.0 * asin(1.0);
}
//---------------------------------------------------------
void calcwradius(double radius, double &volume,
                 double &area, double &circum)
{
   volume = (4.0 / 3.0) * pi() * pow(radius, 3.0);
   area = pi() * radius * radius;
   circum = 2.0 * pi() * radius;
}

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