How can ı choose a defined valuable when ı use input function

Hi Guys, 

I have a homework I have to use valuable that ı defined with numbers like A=0.5..C= 0.3. Users can choose these variable when ı ask to user that vehiclename=input('please enter the veicle name such as A,B,C). If user respond C, the vehiclename will change to value of the C like 0.3.

VehicleName = input('please enter the vehicle name');

if if VehicleName= A || a;

VehicleName = 0.5;

elseif VehicleName= B || b;

VehicleName= 0.4;

elseif VehicleName= C || c

VehicleName= 0.3;

end

You see what ı can do please could you help me ?

Answer 1

[Stephen23]

vn = input('please enter the vehicle name ','s');
switch upper(vn)
    case 'A'
        val = 0.5;
    case 'B'
        val = 0.4;
    case 'C'
        val = 0.3;
    otherwise
        error('this vehicle type is unknown')
end

[Ugur Sahin]

Thank you so much I have done with your help :D