// Inline function that calculates the volume of a sphere.
#include <iostream>
#include <cmath>
using namespace std;
const double PI = 3.14159; // define global constant PI
// calculates volume of a sphere
inline double sphereVolume( const double radius )
{
return 4.0 / 3.0 * PI * pow( radius, 3 );
} // end inline function sphereVolume
int main()
{
double radiusValue = 0;
// prompt user for radius
cout << "Enter the length of the radius of your sphere: ";
cin >> radiusValue; // input radius
// use radiusValue to calculate volume of sphere and display result
cout << "Volume of sphere with radius " << radiusValue
<< " is " << sphereVolume( radiusValue ) << endl;
} // end main
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