int main()
{
const double MY_PI = 3.14159265;
double radius;
cout << "Program calculates the area and circumference of a circle" << endl;
cout << "enter circle radius" << endl;
cin >> radius;
double area = MY_PI*(radius*radius);
double circumference = 2*MY_PI*radius;

//these are the lines with errors
double AREA_STR = "Area of circle with radius " + radius + " is " + area;
double CIRCUM_STR = "Circumference of a circle with radius " + radius + " is " + circumference;

cout << AREA_STR << endl;
cout << CIRCUM_STR << endl;

return 0;