Spaceship Equipped With a Proton Cannon

%% Spaceship Equipped With a Proton Cannon
% Determines the velocity of protons in a resting frame of a movie and in
% the backward direction

% Inputs and Variables
U = input('Ship speed\n');
Uprime = input('Proton cannon speed\n');

% Outputs and Equations
BetaForward = (U+Uprime)/(1+U*Uprime);
BetaBackward = (U-Uprime)/(1+U*-Uprime);
fprintf('Velocity forward: %.4f\nVelocity backward: %.4f\n',BetaForward,BetaBackward)