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/*
.......
(Multi-line comments)
.......
Gal: The program will calculate the area of a circle.
*/
#include <iostream> // cin, cout, fixed, showpoint, endl
#include <iomanip> // for setprecision
using namespace std;
int main()
{
// 1. Variables declaration
const float PI = 3.14;
cout << fixed << showpoint << setprecision(1);
float radius, area;
// 2. Input
cout << "Input the radius (-1 to quit): ";
cin >> radius;
while (radius > 0) // quit the loop for negative radius
{
// 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;
}