Try this:
cas = {'Case_A','Case_B','Case_C','Case_D','Case_E','Case_F','Case_G','Case_H'}
outputFolder = fullfile(pwd, '/answer') % or wherever you want.
for k = 1 : length(cas)
baseFileName = sprintf('%s.pdf', cas{k}) % Use braces around k, NOT parentheses.
fullFileName = fullfile(outputFolder, baseFileName)
print(fullFileName,'-dpdf','-bestfit');
end