Task: Text processing_1





Java: import java.io.File;
import java.util.*;
import static java.lang.System.out;

public class TextProcessing1 {

    public static void main(String[] args) throws Exception {
        Locale.setDefault(new Locale("en", "US"));
        Metrics metrics = new Metrics();

        int dataGap = 0;
        String gapBeginDate = null;
        try (Scanner lines = new Scanner(new File("readings.txt"))) {
            while (lines.hasNextLine()) {

                double lineTotal = 0.0;
                int linePairs = 0;
                int lineInvalid = 0;
                String lineDate;

                try (Scanner line = new Scanner(lines.nextLine())) {

                    lineDate = line.next();

                    while (line.hasNext()) {
                        final double value = line.nextDouble();
                        if (line.nextInt() <= 0) {
                            if (dataGap == 0)
                                gapBeginDate = lineDate;
                            dataGap++;
                            lineInvalid++;
                            continue;
                        }
                        lineTotal += value;
                        linePairs++;

                        metrics.addDataGap(dataGap, gapBeginDate, lineDate);
                        dataGap = 0;
                    }
                }
                metrics.addLine(lineTotal, linePairs);
                metrics.lineResult(lineDate, lineInvalid, linePairs, lineTotal);
            }
            metrics.report();
        }
    }

    private static class Metrics {
        private List<String[]> gapDates;
        private int maxDataGap = -1;
        private double total;
        private int pairs;
        private int lineResultCount;

        void addLine(double tot, double prs) {
            total += tot;
            pairs += prs;
        }

        void addDataGap(int gap, String begin, String end) {
            if (gap > 0 && gap >= maxDataGap) {
                if (gap > maxDataGap) {
                    maxDataGap = gap;
                    gapDates = new ArrayList<>();
                }
                gapDates.add(new String[]{begin, end});
            }
        }

        void lineResult(String date, int invalid, int prs, double tot) {
            if (lineResultCount >= 3)
                return;
            out.printf("%10s  out: %2d  in: %2d  tot: %10.3f  avg: %10.3f%n",
                    date, invalid, prs, tot, (prs > 0) ? tot / prs : 0.0);
            lineResultCount++;
        }

        void report() {
            out.printf("%ntotal    = %10.3f%n", total);
            out.printf("readings = %6d%n", pairs);
            out.printf("average  = %010.3f%n", total / pairs);
            out.printf("%nmaximum run(s) of %d invalid measurements: %n",
                    maxDataGap);
            for (String[] dates : gapDates)
                out.printf("begins at %s and ends at %s%n", dates[0], dates[1]);

        }
    }
}





COBOL:        IDENTIFICATION DIVISION.
       PROGRAM-ID. data-munging.

       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
           SELECT input-file ASSIGN TO INPUT-FILE-PATH
               ORGANIZATION LINE SEQUENTIAL
               FILE STATUS file-status.

       DATA DIVISION.
       FILE SECTION.
       FD  input-file.
       01  input-record.
           03  date-stamp          PIC X(10).
           03  FILLER              PIC X.
           
           
           03  input-data-pairs    PIC X(300).

       WORKING-STORAGE SECTION.
       78  INPUT-FILE-PATH         VALUE "readings.txt".

       01  file-status             PIC 99.
           88 file-is-ok           VALUE 0.
           88 end-of-file          VALUE 10.

       01  data-pair.
           03  val                 PIC 9(3)V9(3).
           03  flag                PIC S9.
               88  invalid-flag    VALUE -9 THRU 0.

       01  val-length              PIC 9.
       01  flag-length             PIC 9.
       01  offset                  PIC 99.

       01  day-total               PIC 9(5)V9(3).
       01  grand-total             PIC 9(8)V9(3).
       01  mean-val                PIC 9(8)V9(3).

       01  day-rejected            PIC 9(5).
       01  day-accepted            PIC 9(5).

       01  total-rejected          PIC 9(8).
       01  total-accepted          PIC 9(8).

       01  current-data-gap        PIC 9(8).
       01  max-data-gap            PIC 9(8).
       01  max-data-gap-end        PIC X(10).

       PROCEDURE DIVISION.
       DECLARATIVES.
       
       input-file-error SECTION.
           USE AFTER STANDARD ERROR ON input-file.
           
           DISPLAY
               "An error occurred while reading input.txt. "
               "File error: " file-status
               ". The program will terminate."
           END-DISPLAY

           GOBACK
           .
            
       END DECLARATIVES.

       main-line.
           
           OPEN INPUT input-file
           IF NOT file-is-ok
               DISPLAY "File could not be opened. The program will "
                   "terminate."
               GOBACK
           END-IF

           
           PERFORM FOREVER
               
               READ input-file
                   AT END
                       EXIT PERFORM
               END-READ

               
               PERFORM UNTIL input-data-pairs = SPACES
                   
                   
                   UNSTRING input-data-pairs DELIMITED BY X"09"
                       INTO val COUNT val-length, flag COUNT flag-length
                   
                   COMPUTE offset = val-length + flag-length + 3
                   MOVE input-data-pairs (offset:) TO input-data-pairs

                   
                   IF NOT invalid-flag
                       ADD val TO day-total, grand-total
                       
                       ADD 1 TO day-accepted, total-accepted
                       
                       IF max-data-gap < current-data-gap
                           MOVE current-data-gap TO max-data-gap
                           MOVE date-stamp TO max-data-gap-end
                       END-IF
                       
                       MOVE ZERO TO current-data-gap
                   ELSE
                       ADD 1 TO current-data-gap, day-rejected,
                           total-rejected
                   END-IF
               END-PERFORM

               
               DIVIDE day-total BY day-accepted GIVING mean-val
               DISPLAY
                   date-stamp 
                   " Reject: " day-rejected
                   " Accept: " day-accepted
                   " Average: " mean-val
               END-DISPLAY

               INITIALIZE day-rejected, day-accepted, mean-val,
                   day-total
           END-PERFORM

           CLOSE input-file

           
           DISPLAY SPACE
           DISPLAY "File:         " INPUT-FILE-PATH
           DISPLAY "Total:        " grand-total
           DISPLAY "Readings:     " total-accepted

           DIVIDE grand-total BY total-accepted GIVING mean-val
           DISPLAY "Average:      " mean-val

           DISPLAY SPACE
           DISPLAY "Bad readings: " total-rejected
           DISPLAY "Maximum number of consecutive bad readings is "
               max-data-gap
           DISPLAY "Ends on date " max-data-gap-end

           GOBACK
           .