error C2512: no appropriate default constructor available

Question

I am getting this annoying error and I don\'t know why =( ! This is the question , I solved it but I am having a problem with the constructor.

Write a

Answer 1

This line invokes a constructor with no arguments (known as default constructor):

Circle C;

The only constructor you have defined is:

Circle(double);

Hopefully this should point you in the right direction.