Question

What is my code missing?

#include <iostream>
#include <string>
using namespace std;

const double PI = 3.141592;
const int LEGAL_AGE = 21;

int main()
{
   double radius;   // input variable holds radius of circle
   int age;       // input variable holds age of user
   string name;       // input variable holds first name of user

   // prompt user for radius
   cout << "Please enter the radius of your circle: ";
   cin >> radius;

   // compute and display the area and circumference
   cout << "Area of circle of radius " << radius << ": " << ____;
   cout << "\nCircumference of circle of radius " << radius << ": " << ____;

   // prompt user for name and age
   // and input name and age
   cout << "\n Welcome, " << ____ << ", you are " << ____ << " years old";
   cout << "\n\nIf you are " << ____ << " or older, you can buy beer.";
   cout << "\n\nIf you are " << ____ << " or older, you can get married w/o your parents' permission.";
   cout << "\n\nIf you are " << ____ - 3 << ", you can vote.";
   cout << "\n -- Done --" << endl;
   return 0;
}

Answer 1

#include <iostream>
#include <string>
using namespace std;

const double PI = 3.141592;
const int LEGAL_AGE = 21;

int main()
{
   double radius;   // input variable holds radius of circle
   int age;       // input variable holds age of user
   string name;       // input variable holds first name of user

   // prompt user for radius
   cout << "Please enter the radius of your circle: ";
   cin >> radius;

   // compute and display the area and circumference
   cout << "Area of circle of radius " << radius << ": " << (PI*radius*radius);
   cout << "\nCircumference of circle of radius " << radius << ": " << (2*PI*radius);

   // prompt user for name and age
   // and input name and age
   cout<<"Enter name: ";
   cin>>name;
   
   cout<<"Enter age: ";
   cin>>age;
    
   cout << "\n Welcome, " << name << ", you are " << age << " years old";
   cout << "\n\nIf you are " << 18 << " or older, you can buy beer.";
   cout << "\n\nIf you are " << 18 << " or older, you can get married w/o your parents' permission.";
   cout << "\n\nIf you are " << 21 - 3 << ", you can vote.";
   cout << "\n -- Done --" << endl;
   return 0;
}