f_in = File::open("data5.txt", "r")
out = File::open("out5.txt", "w")

while(!f_in.eof?)
    n_1 = f_in.gets.strip.to_i
    o_1 = f_in.gets.strip
    n_2 = f_in.gets.strip.to_i
    
    # some corrections
    o_1 = "**" if o_1 == "^"
    o_1 = "==" if o_1 == "="
    out << "#{eval("#{n_1}#{o_1}#{n_2}")}\n"
end

f_in.close
out.close