Computer Science assignment

import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; import java.security.DigestInputStream; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Arrays; import java.util.Scanner; public class WeatherDataTest { private static final int f(int i) { i = (-2040204795 * i - 821977723) ^ 1903171154; i = (-2040204795 * i - 821977723) ^ 1903171154; i = (-2040204795 * i - 821977723) ^ 1903171154; return i; } public static void main(String[] args) throws NoSuchAlgorithmException, IOException { int highPoints = 0, lowPoints = 0, snowfallPoints = 0, precipPoints = 0, lmchPoints = 0, hihiloPoints = 0; try { MessageDigest sha256 = MessageDigest.getInstance("SHA-256"); byte[] hash = { -57, -90, 38, -70, 94, 112, 4, 70, 124, -115, -76, -14, -14, -65, -94, -104, -33, 113, -24, -55, 123, -105, -114, -8, -18, -66, -124, 63, 81, -76, -23, 127 }; DigestInputStream stream = new DigestInputStream(Files.newInputStream(Paths.get("kent100.csv")), sha256); Scanner s = new Scanner(stream); long startC = System.currentTimeMillis(); WeatherData wd = new WeatherData(s); long endC = System.currentTimeMillis(); if (endC - startC > 60001) { System.out.println("Your constructor took too long (" + (endC - startC) / 1000.0 + " seconds)!"); return; } if (s.hasNext()) { System.out.println("*** WARNING *** Your WeatherData constructor is not reading all of the lines!"); while (s.hasNextLine()) { s.nextLine(); // hint, this reads all the lines! } } stream.close(); byte[] digest = sha256.digest(); if (!Arrays.equals(digest, hash)) { System.out.println("*** WARNING *** Your kent100.csv file does not have the expected contents!"); } boolean[] lows = { false, true, true, true, true, false, true, false, true, true, true, true, false, true, false, true, true, false, true, false, true, false, true, true, true, true, false, true, false, true, false, true, true, true, true, false, true, false, true, true, false, true, false, true, true, true, true, true, true, false, true, true, true, true, true, true, false, true, false, true, true, false, true, false, true, false, true, true, false, true, false, true, false, true, true, false, true, false, true, false, true, true, false, true, false, true, true, true, true, false, true, false, true, false, true, true, false, true, false, true, false, true, true, true, true, false, true, false, true, true, false, true, false, true, false, true, true, true, true, false, true, false, true, true, false, true, false, true }; { System.out.println("Testing highTemp() and lowTemp()..."); boolean[] his = { false, true, true, true, true, false, true, false, true, false, true, true, false, true, false, true, false, true, true, false, true, false, true, false, true, true, false, true, false, true, false, true, true, false, true, false, true, false, true, true, true, true, false, true, false, true, true, false, true, false, true, false, true, true, false, true, false, true, false, true, true, true, true, false, true, false, true, true, true, true, false, true, false, true, true, true, true, false, true, false, true, true, true, true, false, true, false, true, true, true, true, false, true, false, true, true, true, true, false, true, false, true, true, true, true, false, true, false, true, true, true, true, false, true, false, true, true, true, true, false, true, false, true, false, true, true, false, true }; int i = 0; int j = 0; int hiErrors = 0, lowErrors = 0; long totalHiTime = 0, totalLowTime = 0; do { int hi = i, lo = i - 16; try { long start = System.nanoTime(); boolean hit = wd.highTemp(hi); long end = System.nanoTime(); totalHiTime += end - start; if (end - start > 1_000_000_001) { System.out.println("highTemp(" + hi + ") executed too slowly (over 1 second)! No credit will be awarded."); hiErrors = 10; } if (hit != his[j]) { if (hiErrors < 10) { System.out.println( "highTemp(" + hi + ") returned " + hit + " but should have returned " + his[j]); } hiErrors++; if (hiErrors == 10) { System.out.println("Further highTemp errors suppressed."); } } } catch (Error e) { if (hiErrors < 10) { System.out.println("highTemp(" + hi + ") should have returned " + his[j] + " but instead caused the following error:"); e.printStackTrace(System.out); } hiErrors++; if (hiErrors == 10) { System.out.println("Further highTemp errors suppressed."); } } try { long start = System.nanoTime(); boolean lowt = wd.lowTemp(lo); long end = System.nanoTime(); totalLowTime += end - start; if (end - start > 1_000_000_001) { System.out.println("lowTemp(" + lo + ") executed too slowly (over 1 second)! No credit will be awarded."); lowErrors = 10; } if (lowt != lows[j]) { if (lowErrors < 10) { System.out.println("lowTemp(" + lo + ") returned " + lowt + " but should have returned " + lows[j]); } lowErrors++; if (lowErrors == 10) { System.out.println("Further lowTemp errors suppressed."); } } } catch (Error e) { if (lowErrors < 10) { System.out.println("lowTemp(" + lo + ") should have returned " + lows[j] + " but instead caused the following error: "); e.printStackTrace(System.out); } lowErrors++; if (lowErrors == 10) { System.out.println("Further lowTemp errors suppressed."); } } i = (i + 73) & 127; j++; } while (i != 0); if (i == 0 && j > 0) { highPoints = Math.max(10 - hiErrors, 0); if (totalHiTime > 1_000_001) { System.out.println( "10% penalty for slow highTemp() method (over 1 microsecond total time to perform 128 tests)."); highPoints--; } lowPoints = Math.max(10 - lowErrors, 0); if (totalLowTime > 1_000_001) { System.out.println( "10% penalty for slow lowTemp() method (over 1 microsecond total time to perform 128 tests)"); lowPoints--; } } else { System.out.println("No highTemp or lowTemp points earned due to above errors."); } } { System.out.println("Testing totalSnowfallForYear()..."); int i = 0; int j = 0; int[] snowfalls = { -1752268662, 917322763, 1340974736, -466659731, -1270175165, 163744315, -1193704175, -575099871, -833516786, -607796849, -1407963941, 988084603, 2136831692, -1312788925, -2013044980, -834419108, -176499462, -1602046485, 702139136, 541914845, -697833018, 854010731, -510718124, 1005092753, -37894590, -1651317416, -54548248, 998372895, 209707190, -2030734947, 301262140, -655057479, 651921783, 558719453, -76721255, 800863501, -1873884782, -1671906981, -1349793852, -2029206079, -723375054, -1366532725, 217021720, -1589355154, 2144993830, -1381535773, 1937130442, -845629975, -414262630, 1069095095, -219075913, 844279549, 1691187214, -133847459, 684969204, -970490959, 1217776738, -345206063, -1800207736, -362000315, 1155974458, -945682989, -507798820, -1819108289, 1040862942, 827306599, 245937332, -1838517291, 793636414, -2118496773, -656904476, 445451862, -1036132142, -2049790385, 1453716242, -1636289099, 2142051191, -2117339535, 675860515, -1979272183, -1495939398, -572562345, -98685504, -695495887, -1694871634, 1843962777, 784426260, -334663343, -1150050147, 1794108095, -2136929250, 342367717, -523851250, -1424579725, -857843204, 870150877, 1762677749, 192742663, 1315633904, -34419507, 657068766, -1284182865, 1922135956, 1724344961, -1887637262, -1296559121, 1858161112, -347077675, -392898842, 1690184377, 1838096858, -1736095390, -1164219302, -503754257, 2024988896, 384712235, 1194723534, -234899893, 428821528, -876329438, -255229309, 1938072031, -1565240368, 970237445, -1120044650, -1030008530, -133601964, -2006031240 }; int snowfallErrors = 0; long totalSnowTime = 0; do { int year = i + 1900; try { long start = System.nanoTime(); double snowfall = wd.totalSnowfallForYear(year); long end = System.nanoTime(); if (end - start > 1_000_000_001) { System.out.println("totalSnowfallForYear(" + year + ") executed too slowly (over 1 second)! No credit will be awarded."); snowfallErrors = 10; } totalSnowTime += end - start; if (f((int) Math.round(snowfall * 10)) + f(j) != snowfalls[j]) { // prevent calculation // rounding errors if (snowfallErrors < 10) { System.out.println("totalSnowfallForYear(" + year + ") returned " + snowfall + " but this is not correct."); } if (snowfallErrors == 0) { System.out.println( "It's OK if the calculation is off by 0.01 or less but yours is off by too much."); } snowfallErrors++; if (snowfallErrors == 10) { System.out.println("Further totalSnowfallForYear errors suppressed."); } } } catch (Error e) { if (snowfallErrors < 10) { System.out.println("snowfall(" + year + ") should have returned, but instead caused the following error:"); e.printStackTrace(System.out); } snowfallErrors++; if (snowfallErrors == 10) { System.out.println("Further totalSnowfallForYear errors suppressed."); } } i = (i + 73) & 127; j++; } while (i != 0); if (i == 0 && j > 0) { snowfallPoints = Math.max(20 - 2 * snowfallErrors, 0); if (totalSnowTime > 1_000_001) { System.out.println( "10% penalty for slow totalSnowfallForYear() method (over 1 microsecond total time to perform 128 tests)."); snowfallPoints -= 2; } } } { int[] precips = { 171654687, -80766404, 1641012970, -2112588716, 328408167, -1978664247, -1822666317, 1051797495, -107514988, 1727823783, 1863975851, -1039997795, 1426132396, -1876066588 }; System.out.println("Testing averagePrecipitationForMonth()..."); int precipErrors = 0; int i = 0; long totalPrecipTime = 0; for (i = 0; i <= 13; i++) { try { long start = System.nanoTime(); double precip = wd.averagePrecipitationForMonth(i); long end = System.nanoTime(); if (end - start > 1_000_000_001) { System.out.println("averagePrecipitationForMonth(" + i + ") executed too slowly (over 1 second)! No credit will be awarded."); precipErrors = 10; } totalPrecipTime += end - start; if (f((int) Math.round(precip * 10000)) + f(i + 12345) != precips[i]) { if (precipErrors < 10) { System.out.println("averagePrecipitationForMonth(" + i + ") returned" + precip + " but this is not correct."); } precipErrors++; if (precipErrors == 10) { System.out.println("Further averagePrecipitationForMonth errors suppressed."); } } } catch (Error e) { if (precipErrors < 10) { System.out.println("averagePrecipitationForMonth(" + i + ") should have returned, but instead caused the following error: "); e.printStackTrace(System.out); } precipErrors++; if (precipErrors == 10) { System.out.println("Further averagePrecipitationForMonth errors suppressed."); } } } if (i == 14) { precipPoints = 20 - 2 * precipErrors; if (totalPrecipTime > 100_001) { System.out.println( "10% penalty for slow averagePrecipitationForMonth() method (over .1 microsecond total time to perform 14 tests)."); precipPoints -= 2; } } } { System.out.println("Testing lowestMostCommonHighForMonth()..."); int[] lmch = { -1357970400, -1079510493, 1784918775, 1889144476, -1015071560, 1219122936, 1052785283, 1647435485, 814929440, 995530212, 1361500860, -335753802 }; int lmchErrors = 0; int i = 0; long lmchTime = 0; for (i = 1; i <= 12; i++) { try { long start = System.nanoTime(); int hi = wd.lowestMostCommonHighForMonth(i); long end = System.nanoTime(); if (end - start > 1_000_000_001) { System.out.println("lowestMostCommonHighForMonth(" + i + ") executed too slowly (over 1 second)! No credit will be awarded."); lmchErrors = 10; } lmchTime += end - start; if (f(hi) + f(i + 23456) != lmch[i - 1]) { if (lmchErrors < 10) { System.out.println("lowestMostCommonHighForMonth(" + i + ") returned " + hi + " but this is not correct."); } lmchErrors++; if (lmchErrors == 10) { System.out.println("Further lowestMostCommonHighForMonth errors suppressed."); } } } catch (Error e) { if (lmchErrors < 10) { System.out.println("lowestMostCommonHighForMonth(" + i + ") should have returned, but instead caused the following error: "); e.printStackTrace(System.out); } lmchErrors++; if (lmchErrors == 10) { System.out.println("Further lowestMostCommonHighForMonth errors suppressed."); } } } if (i == 13) { lmchPoints = 20 - 2 * lmchErrors; if (lmchTime > 100_001) { System.out.println( "10% penalty for slow lowestMostCommonHighForMonth() method (over .1 microsecond total time to perform 14 tests)."); lmchPoints -= 2; } } } { int[] hihilo = { 0, 1605867789, -1239618488, -278684187, -190875739, 0, -2011674683, 0, -1467250347, -63300811, -1237673962, -670038749, 0, -1124813381, 0, -1246096698, -453436879, 0, -149372284, 0, -121501661, 0, 1434293201, -1320584161, -610096094, -1651317416, 0, 79579628, 0, -2134259431, 0, -790426079, -171760576, -443772708, -965204271, 0, -1334335647, 0, -1022104915, -1122567392, 0, 1626461779, 0, 1107814523, -180683084, -1516904373, -1580235570, 1249006404, 765443687, 0, 371757233, -1488711895, -1709354624, -1871228391, -63621335, 683092199, 0, 669165701, 0, -34311378, -1500320499, 0, 671907497, 0, -1626499277, 0, 934482358, -1838517291, 0, -2002517210, 0, -1634722466, 0, 44845994, -493159364, 0, 942174734, 0, 1276260914, 0, 449071927, -1546196228, 0, 720399816, 0, -1266638310, 514644617, 1383185812, -1193560229, 0, -40040488, 0, -1644658968, 0, 1087168121, -1106731853, 0, -1556319557, 0, -606621011, 0, -1869896593, -389503959, -337122141, -2089556814, 0, 1109570573, 0, 1324950313, -1076208568, 0, 1892388648, 0, -1440320340, 0, -1251101696, 797018730, 341333444, -1694206748, 0, 1718863424, 0, -2018039396, 1340970334, 0, -1357803809, 0, -171735346 }; System.out.println("Testing highestHighForLow()..."); int i = 0; int j = 0; int lowErrors = 0; long totalLowTime = 0; do { if (lows[j]) { int lo = i - 16; try { long start = System.nanoTime(); int hit = wd.highestHighForLow(lo); long end = System.nanoTime(); totalLowTime += end - start; if (end - start > 1_000_000_001) { System.out.println("highestHighForLow(" + lo + ") executed too slowly (over 1 second)! No credit will be awarded."); lowErrors = 10; } if (f(hit) + f(j) != hihilo[j]) { if (lowErrors < 10) { System.out.println("highestHighForLow(" + lo + ") returned " + hit + " but this is not correct."); } lowErrors++; if (lowErrors == 10) { System.out.println("Further highestHighForLow errors suppressed."); } } } catch (Error e) { if (lowErrors < 10) { System.out.println("highestHighForLow(" + lo + ") should have returned " + lows[j] + " but instead caused the following error: "); e.printStackTrace(System.out); } lowErrors++; if (lowErrors == 10) { System.out.println("Further highestHighForLow errors suppressed."); } } } i = (i + 73) & 127; j++; } while (i != 0); if (i == 0 && j > 0) { hihiloPoints = 20 - 2 * lowErrors; if (totalLowTime > 1_000_001) { System.out.println( "10% penalty for slow highestHighForLow() method (over 1 microsecond total time to perform 128 tests)"); lowPoints--; } } else { System.out.println("No highestHighForLow points earned due to above errors."); } } } finally { highPoints = Math.max(highPoints, 0); lowPoints = Math.max(lowPoints, 0); snowfallPoints = Math.max(snowfallPoints, 0); precipPoints = Math.max(precipPoints, 0); lmchPoints = Math.max(lmchPoints, 0); hihiloPoints = Math.max(hihiloPoints, 0); System.out.println("highTemp: " + highPoints + " / 10"); System.out.println("lowTemp: " + lowPoints + " / 10"); System.out.println("totalSnowfallForYear: " + snowfallPoints + " / 20"); System.out.println("averagePrecipitationForMonth: " + precipPoints + " / 20"); System.out.println("lowestMostCommonHighForMonth: " + lmchPoints + " / 20"); System.out.println("highestHighForLow: " + hihiloPoints + " / 20"); if ((highPoints + lowPoints + snowfallPoints + precipPoints + lmchPoints + hihiloPoints) == 100) { System.out.println("Speed bonus!"); System.out.println("Total: 102 / 100"); } else { System.out.println( "Total: " + (highPoints + lowPoints + snowfallPoints + precipPoints + lmchPoints + hihiloPoints) + " / 100"); } } } }