C++: Finding area of a circle(function)

#include<iostream.h>

float area(int x,float a )

{

a = (x*x)*(3.14);

return a;

}

int  main()

{

            float a,int x;

            cout<<"enter x"<<endl;cin>>x;

a = (x*x)*(3.14);

cout<<"area="<<a;

return 0;

}