Write a program that defines and uses a struct which stores the contents necessary to define a four-vector (What is a four vector?), which contains the kinetic information of a particle - i.e. Energy, px, py, pz. In your main function, define two instances of these four vectors. Then, create a third instance which is the sum of the first two four vectors. Calculate the invariant mass of this four vector and print that to the terminal. (NOTE : Throughout this entire exercise, you can assume that the speed of light, c, is unity, and you need not worry about finding a way to encode physical units in your code.)

Writting in C++