Pendulum in an Electric Field

%% Pendulum in an Electric Field
% Can calculate the angle of deflection in degrees and radians of a
% pendulum in an electric field. Notes are at the bottom of the page

% Constants
g = 9.81;            %[m/s^2] Acceleration due to gravity on earth

% Variables
q = input('The charge of mass object in Coulombs\n');
E = input('The electric field in N/C\n');
m = input('The mass of the charged object in kg\n');
% Optional variable for relative permittivity
Er = input('The relative permittivity if applicable (if not enter 1)\n');

% Equations and output
radians = round(atan((q*E/Er)/(m*g)), 3, 'significant');
degrees = round(atand((q*E/Er)/(m*g)), 3, 'significant');
a = input('Do you want the angle in radians, degrees, or both?\n');
switch a
    case 1
        fprintf('The angle in radians is %i', radians)
    case 2
        fprintf('The angle in degrees is %i', degrees)
    case 3
        fprintf('The angle in radians and degrees is %i and %i', radians, degrees)
end


%{
For the value of the electric field,
    V/m is equal to N/C so no conversions are necessary if the electric field
    is given in those units
This program rounds to 3 significant figures.
    To change or remove this option see line 16 and 17

This paste is different than my past "Function: Pendulum in Electric"
    Obviously that one is a function file and it will not ask for inputs.
    The other file does NOT round to three significant figures.
    Answers in the other paste will be given in matrix form.
%}