//EX 1-27
#include <iostream.h>
int main()

{
	int radius, diameter, circumference, area, pi;

	cout << " Enter the radius of a circle\n";
	
	cin >> radius;

	pi = 3.14159;

	diameter = 2 * radius;
		
	circumference = 2 * pi * radius;

	area = pi * (radius)^2;
	cout << "Diameter formula executing.....(2 x r)\n";
	cout << "Diameter is " << diameter << endl;
	cout << "circumference formula executing.....(2 x pi x r)\n";
	cout << "circumference is " << circumference << endl;
	cout << "area formula executing......(pi x [r x r])\n";
	cout << "area is " << area << endl;

return 0;
}