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