What is needed for max to work with three values

Question

Hi

Refer code below:

Why max function not working with neither three object of test class nor int class .

What is wrong in this code?
https://sololearn.com/compiler-playground/cSZ11nxm1HR0/?ref=app

Answer 1

Ketan Lalcheta you forgot to add...

#include <algorithm> // Include for std::max

Answer 2

For two object comparison, algorithm header is it not needed ?

Answer 3

Should still use out of habit but if I recall no reason actually to.