Please help me to finish this. It should be easy, but I have no idea. Thank you

Question

Please help me to finish this. It should be easy, but I have no idea.

Thank you very much!

#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;

// Some CONSTANTS you may find useful.
const double PI = atan(1.0)*4;
const double FEET_PER_MILE = 5280;
const double INCHES_PER_FOOT = 12;
const double INCHES_PER_MILE = FEET_PER_MILE*INCHES_PER_FOOT;
const double MINUTES_PER_HOUR = 60;
const double SECONDS_PER_MINUTE = 60;
const double DEFAULT_TIRE_SIZE = 15;

class Wheel {
public:
// Set the speed and rpms to zero and the radius to DEFAULT_TIRE_SIZE
Wheel(){
   double speed = 0.0;
   double rpms = 0.0;
   double radius = DEFAULT_TIRE_SIZE:
}

// Set the speed and rpms to zero and the radius to in_radius
Wheel(double in_radius){
   double speed = 0.0;
   double rpms = 0.0;
   double radius = in_radius;
}

// set the wheel radius and a vehicle speed in MPH.
// Calculate the RPM based on speed and radius
Wheel(double in_radius, double in_speed){
   // FILL IN
}

// Set the RPM and update the speed
// We have count revolution in a certain interval of time
// seconds
void setRPM(double in_revolutions, double in_time){
   // FILL IN
}

// Set a new speed and update the RPM
void setSpeed(double in_speed){
   // FILL IN
}

double getRadius(){
   // FILL IN
}
double getDiameter(){
   // FILL IN
}
double getCircumference(){
   // FILL IN
}
double getSurfaceArea(){
   // FILL IN
}
double getSpeed(){
   // FILL IN
}
double getRPM(){
   // FILL IN
}

// Display the Wheel Parameters
void displayParameters(){
cout << "Wheel Radius: " << radius << endl;
cout << "Speed: " << speed << " MPH" << endl;
cout << "Wheel Circumference: " << getCircumference() << " inches" << endl;
cout << "Wheel Spin Rate: " << rpm << " RPM" << endl;
}

private:
double radius; // radius inches
double speed; // MPH
double rpm; // RPM
};

Explanation / Answer

RPM formula = linear distance traveled divided by linear distance per wheel RPM.

Find the diameter (d) of the wheel by multiplying the radius (r) by two: 2 * r = d.

Find the circumference (C) of the wheel by multiplying the diameter by pi, which is approximately 3.14159: d * pi = C.

Multiply C by the rpm to get the velocity (v) in units per minute. For example, if the value of C is in inches, v will be in inches per minute: C * rpm = v.

If desired, convert v from inches per minute to miles per hour by multiplying by 60/63,360, or 0.00095.

Wheel(double in_radius, double in_speed){
double distance=2*in_radius;

double circumference=PI*distance;

}

void setRPM(double in_revolutions, double in_time){
  double velocity=circumference*RPM;
}

void setSpeed(double in_speed){
System.out.println("in_speed");

}

double getRadius(){
double radius=in_radius;

System.out.println("radius");
}
double getDiameter(){
double diameter=2*in_radius;

System.out.println("diameter");
}
double getCircumference(){
double circum=PI*distance;

System.out.println("circumference");
}
double getSurfaceArea(){
double sa=2*PI*in_radius;

System.out.println("surface area");
}

  
double getSpeed(){
double speed=distance/MINUTES_PER_HOUR;

cout << "Speed: " << speed << " MPH" << endl;
}
double getRPM(){
cout << "Wheel Circumference: " << getCircumference() << " inches" << endl;
cout << "Wheel Spin Rate: " << rpm << " RPM" << endl;
}
}

NOTE:-I have written the diaply messages in java just convert into c++

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