Structure Problem

[hannah_banana10]

My code does not display the value that the user inputs, but displays all zeros. Why?

#include <iostream>
#include <iomanip>
using namespace std;

struct Circle
{
	double radius; 
	double diameter; 
	double area; 
	double circumference; 

	Circle( )
	{
		radius = 0; 
		diameter = 0; 
		area = 0; 
		circumference = 0; 

	}

};
Circle getCircleData();
void calculateCircleData (Circle &);
void displayCircleData (Circle);

int main()
{
	Circle c1; 

	cout << "Welcome to our Circle Calculator" << endl;
	cout << "--------------------------------" << endl;

	getCircleData();
	calculateCircleData (c1);
	displayCircleData (c1);


return 0;
}

Circle getCircleData( )
{
	Circle c1;
	cout << "Enter the radius for the first circle: " << endl; 
	cin >> c1.radius;

	return c1;
}

void calculateCircleData (Circle &c1)
{
	c1.diameter = c1.radius *2;
	c1.area = c1.radius * c1.radius * 3.14159;
	c1.circumference = c1.radius * 2 * 3.14159; 

}

void displayCircleData (Circle c1)
{ 
	cout << "The circle data is: " << endl;
	cout << "Radius: " << c1.radius << fixed << setprecision(2) << endl; 
	cout << "Diameter: " << c1.diameter << fixed << setprecision(2) << endl;
	cout << "Area: " << c1.area << fixed << setprecision(2) << endl; 
	cout << "Circumference" << c1.circumference << fixed << setprecision(2) << endl; 
	

}

[anon]

The problem is that you don't use the Circle returned from getCircleData.

[nicoqwertyu]

Why not pass the circle, defined in main, to getCircleData -- similar to how you did calculateCircleData?

[hannah_banana10]

Well how do I use it??
Because my assignement says that it has to be "getCircleData()" so I can't pass anything to it.

[laserlight]

For starters:

Circle c1 = getCircleData();

[Salem]

Basically the same question
Circle Program Issues