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/*
Multi-line comments
*/
#include <iostream>
#include <iomanip> // for setpercision
using namespace std;
int main()
{
const float PI = 3.14;
cout << fixed << showpoint << setprecision(1);
float radius, area;
//2. input
cout << "Input the radius: ";
cin >> radius;
while( radius > 0)
{
//3. computing
area = PI * radius * radius;
// 4. output
cout << "The area is: " << area << endl;
cout << "Input the radius (-1 to quit): ";
cin >> radius;
}
return 0;
}