I want to write a C++ program to read the diameter of a circle. The program should find and display the area and circumference of the circle. Define a constant of type double PI = 3.14159 I need code for this program

#include <iostream>

const double PI = 3.14159;

int main() {

   double diameter;

   std::cin >> "Please enter the diameter of the circle:" << std::endl;

   std::cin >> diameter;

   double radius = diameter / 2;

   double area = radius * radius * PI;

   double circumference = 2 * radius * PI; // or diameter * PI;

   std::cout << "Area: " << area << std::endl;

   std::cout << "Circumference: " << circumference << std::endl;

}

Explanation:

The first line imports the read/write library. The rest should be self-explanatory.

answer(true);