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// Something more or less useful. This proggy takes raidius of a circle as user input and outputs the // diameter, circumference and area.// Ill'z own production #include <iostream>using std::cin;using std::cout;using std::endl;int main(){	int r;	float pi;	pi = 3.14159;		cout << "Please enter the radius of your circle ";	cin >> r; 	cout << "The diameter is " << 2 * r << endl;	cout << "The circumference is " << 2 * pi *r << endl;	cout << "The area is " << pi * r *r << endl;		return 0;}