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/*
Multiline comments
compiling: g++
ex....
goal...
*/
#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
{
//3. computation
area = PI * radius * radius;
//4. output
cout << "the area is: " << area << endl;
cout << "Input the radius (-1 to quit): ";
cin >> radius;
}
return 0;
}