Someone has created the following code to display the frequency of subway trains

Question

Someone has created the following code to display the frequency of subway trains in a terminal and the names of the train lines are A, B, C, D and E. Rewrite the code using the nested if as a switch structure, but do not change the prompt (You may assume the user enters an upper case letter at the prompt.)

Line = input(‘Enter the line.’,’s’)
if Line > ‘A’ & Line < ‘E’
if Line == ‘C’
disp(‘This train arrives every 12 minutes.’)
else
disp(‘This train arrives every 18 minutes.’)
end
else
if Line == ‘A’
disp(‘This train arrives every 24 minutes.’)
else
if Line ~= E
disp(‘This train is not in service.’)
else
disp(‘This train arrives every 30 minutes.’)
end
end
end

Explanation / Answer

Line = input('Enter the line.','s'); switch Line case 'A' disp('This train arrives every 24 minutes.') case {'B', 'D'} disp('This train arrives every 18 minutes.') case 'C' disp('This train arrives every 12 minutes.') case 'E' disp('This train arrives every 30 minutes.') otherwise disp('This train is not in service.') end

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