question about circle calculate

i can't debug this i think it was right plz help

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  #include<iostream>
using namespace std;
int main()
{
	double pi, radius, area, circumference, diameter;

	pi = 3.14159;

	cout << "please input the value radius :";
	
	cin >> radius;

	area = pi * (radius*radius);
	
	circumference = 2 * pi * radius;
	
	diameter = radius * 2;

	
	cout << "Diamater is " << diameter << "." << endl;
	
	cout << "Circumference is " << circumference << "." << endl;
	
	cout << "Area is " << area << "." << endl;

	return 0;

}
What exactly is your problem?
can't debug
What gives you the impression there is debugging required? In other words, what is the problem that you encounter?
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