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A C++ program to calculate the area of a circle when the radius is given using a simple function

#include <iostream>
float circarea(float radius);//Function prototype
using namespace std;
int main ()
{
        float r,cArea;
        cout<<"Enter the radius of the circle: ";
        cin>>r;

        cArea=circarea(r);//Calling function

        cout<<"The area of the circle is "<<cArea<<endl;
        return 0;
}

float circarea(float radius)//Called function
{
        const double pi=22/7.0;
        float area=pi*radius*radius;
        return area;
}