Two Resistors in Parallel

%% Two Resistors in Parallel
% Calculates the voltage and individual currents across the resistors
% Notes and clarifications are at the bottom of the code.

resis = input('Input resistances in brackets\n');
a = input('Given the current of R1 or R2?\n');
switch a
    case 1
        I(1) = input('Current across R1\n');
        V = I(1)*resis(1);
        I(2) = V/resis(2);
    case 2
        I(2) = input('Current across R2\n');
        V = I(2)*resis(2);
        I(1) = V/resis(1);
end
Isum = sum(I);
fprintf(['The voltage and individual and total currents are \n', ...
       '%.4e V,  %.3i A, %.3i A, %.3i A'], V, I, Isum)

%{
When prompted, the user needs to input the resistors in brackets []
The output values are rounded to the third decimal place. To change or remove
    this edit the .# in the last line of the fprintf.
The output gives values in the order of voltage across the resistors, the
    individual currents across the resistors, and the sum of the current
    across both resistors.
%}