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Task/Text-processing-1/Ruby/text-processing-1.rb

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+filename = "readings.txt"
+total = { "num_readings" => 0, "num_good_readings" => 0, "sum_readings" => 0.0 }
+invalid_count = 0
+max_invalid_count = 0
+invalid_run_end = ""
+
+File.new(filename).each do |line|
+  num_readings = 0
+  num_good_readings = 0
+  sum_readings = 0.0
+
+  fields = line.split
+  fields[1..-1].each_slice(2) do |reading, flag|
+    num_readings += 1
+    if Integer(flag) > 0
+      num_good_readings += 1
+      sum_readings += Float(reading)
+      invalid_count = 0
+    else
+      invalid_count += 1
+      if invalid_count > max_invalid_count
+        max_invalid_count = invalid_count
+        invalid_run_end = fields[0]
+      end
+    end
+  end
+
+  printf "Line: %11s  Reject: %2d  Accept: %2d  Line_tot: %10.3f  Line_avg: %10.3f\n",
+    fields[0], num_readings - num_good_readings, num_good_readings, sum_readings,
+    num_good_readings > 0 ? sum_readings/num_good_readings : 0.0
+
+  total["num_readings"] += num_readings
+  total["num_good_readings"] += num_good_readings
+  total["sum_readings"] += sum_readings
+end
+
+puts ""
+puts "File(s)  = #{filename}"
+printf "Total    = %.3f\n", total['sum_readings']
+puts "Readings = #{total['num_good_readings']}"
+printf "Average  = %.3f\n", total['sum_readings']/total['num_good_readings']
+puts ""
+puts "Maximum run(s) of #{max_invalid_count} consecutive false readings ends at #{invalid_run_end}"