Function

Question

What is the difference between these two function and which of these ist better or more useful

#include <iostream>
using namespace std;

float circle(float radius, float area)
{
area = radius * radius * 3.14;
return area;
}
int main()
{
float radius, area;
cout << "what is the raduis of the circle" << '\t';
cin >> radius;
cout<<"the area of the circle is" << '\t'<<
circle(radius,area);
return 0;
}

#include <iostream>
using namespace std;

float circle(float);

int main()
{
float radius, area;
cout << "what is the raduis of the circle" << '\t';
cin >> radius;
area = circle(radius);
cout << "the area of the circle is" << '\t' << area << endl;
return 0;
}
float circle(float radius)
{
return radius * radius * 3.14;
}

Answer 1

In the first function you have this second parameter `area` that is never used so there's no reason to include it. I think I know what you were trying to do but you'll learn about that later (it's about pointers).

The second function seems fine. That's how I would write it.