#include
#include
#include
using namespace std;
int main()
{
double area;
cout << "Please enter the area of a square: ";
cin >> area;
if (cin.fail())
{
cout << "Error: Bad input\n";
return 1;
}
if (area < 0)
{
cout << "Error: Negative area.\n";
return 1;
}
cout << "The side length is " << sqrt(area) << "\n";
return 0;
}