bug: ArrayExamples reversed returns an array full of zeroes instead of the reversed array. this is because instead of copying from the given array (arr) to the empty array (newArray), we copy from the empty array to the given array (resulting in copying over a bunch of zeroes) and return the zeroed out array arr. to fix this, we copy from arr to newArray and return newArray.
failure inducing input:
@Test
public void testReversed1() {
int[] input1 = {1, 2, 3};
assertArrayEquals(new int[]{3, 2, 1}, ArrayExamples.reversed(input1));
}
non-failure inducing input:
@Test
public void testReversed2() {
int[] input1 = { };
assertArrayEquals(new int[]{ }, ArrayExamples.reversed(input1));
}
symptom:
bug:
//before
static int[] reversed(int[] arr) {
int[] newArray = new int[arr.length];
for(int i = 0; i < arr.length; i += 1) {
arr[i] = newArray[arr.length - i - 1];
}
return arr;
}
//after
static int[] reversed(int[] arr) {
int[] newArray = new int[arr.length];
for(int i = 0; i < arr.length; i += 1) {
newArray[i] = arr[arr.length - i - 1];
}
return newArray;
}
changed it from copying from the given array (arr) to the empty array (newArray) to copying from arr to newArray, and am now returning newArray.
for all of these examples, i just used the man page.
the -ipath option finds all files such that the path of the file matches the pattern passed after -path, case insensitive.
##finding all files in ./technical/ with "oo" in their path. why? because it looks like a pig nose.
[yuehua@fedora docsearch]$ find ./technical/ -ipath "*oo*" -type f
./technical/government/Env_Prot_Agen/ro_clear_skies_book.txt
./technical/government/Media/AP_LawSchoolDebts.txt
./technical/government/Media/Advocate_for_Poor.txt
./technical/government/Media/Boone_legal_service.txt
./technical/government/Media/FY_04_Budget_Outlook.txt
./technical/government/Media/Firm_to_the_Poor_Needs_Help.txt
./technical/government/Media/Good_guys_reward.txt
./technical/government/Media/Law-school_grads.txt
./technical/government/Media/Law_Schools.txt
./technical/government/Media/Legal_Aid_looks_to_legislators.txt
./technical/government/Media/Legal_services_for_poor.txt
./technical/government/Media/Legal_system_fails_poor.txt
./technical/government/Media/Oregon_Poor.txt
./technical/government/Media/Poor_Lacking_Legal_Aid.txt
./technical/government/Media/Too_Crucial_to_Take_Cut.txt
./technical/government/Media/Unusual_Woodburn.txt
./technical/government/Media/Using_Tech_Tools.txt
##finding all files with the characters of "amogus" in order :)
[yuehua@fedora docsearch]$ find ./technical/ -ipath "*a*m*o*g*u*s*"
./technical/government/About_LSC/LegalServCorp_v_VelazquezDissent.txt
./technical/government/About_LSC/LegalServCorp_v_VelazquezSyllabus.txt
./technical/government/Gen_Account_Office/GovernmentAuditingStandards_yb2002ed.txt
./technical/government/Media/Good_guys_reward.txt
the -ls option prints the files with some additional information, in the format of ls -dils.
##information about the directories in ./technical/
1384419 0 drwxr-xr-x 1 yuehua yuehua 58 Oct 31 11:11 ./technical/
1384420 0 drwxr-xr-x 1 yuehua yuehua 474 Oct 31 11:11 ./technical/911report
1384438 0 drwxr-xr-x 1 yuehua yuehua 29500 Oct 31 11:11 ./technical/biomed
1385276 0 drwxr-xr-x 1 yuehua yuehua 150 Oct 31 11:11 ./technical/government
1385277 0 drwxr-xr-x 1 yuehua yuehua 922 Oct 31 11:11 ./technical/government/About_LSC
1385295 0 drwxr-xr-x 1 yuehua yuehua 132 Oct 31 11:11 ./technical/government/Alcohol_Problems
1385300 0 drwxr-xr-x 1 yuehua yuehua 402 Oct 31 11:11 ./technical/government/Env_Prot_Agen
1385315 0 drwxr-xr-x 1 yuehua yuehua 2504 Oct 31 11:11 ./technical/government/Gen_Account_Office
1385407 0 drwxr-xr-x 1 yuehua yuehua 6128 Oct 31 11:11 ./technical/government/Media
1385553 0 drwxr-xr-x 1 yuehua yuehua 662 Oct 31 11:11 ./technical/government/Post_Rate_Comm
1385568 0 drwxr-xr-x 1 yuehua yuehua 9696 Oct 31 11:11 ./technical/plos
##some extra information about those amogus files
[yuehua@fedora docsearch]$ find ./technical/ -ipath "*a*m*o*g*u*s*" -ls
1385280 28 -rwxr-xr-x 1 yuehua yuehua 28121 Oct 31 11:11 ./technical/government/About_LSC/LegalServCorp_v_VelazquezDissent.txt
1385282 8 -rwxr-xr-x 1 yuehua yuehua 7083 Oct 31 11:11 ./technical/government/About_LSC/LegalServCorp_v_VelazquezSyllabus.txt
1385316 244 -rwxr-xr-x 1 yuehua yuehua 246218 Oct 31 11:11 ./technical/government/Gen_Account_Office/GovernmentAuditingStandards_yb2002ed.txt
1385460 8 -rwxr-xr-x 1 yuehua yuehua 6946 Oct 31 11:11 ./technical/government/Media/Good_guys_reward.txt
the -max/mindepth n options only traverses through a certain number of levels, so that directories deeper than or less deep than a certain depth are not traversed. This can help to filter some files out.
##finding directories not immediately in ./technical/
[yuehua@fedora docsearch]$ find ./technical/ -mindepth 2 -type d
./technical/government/About_LSC
./technical/government/Alcohol_Problems
./technical/government/Env_Prot_Agen
./technical/government/Gen_Account_Office
./technical/government/Media
./technical/government/Post_Rate_Comm
##finding some files with a 7 in the path no deeper than two layers down. output was piped into head because it was very long.
[yuehua@fedora docsearch]$ find ./technical/ -maxdepth 2 -ipath "*7*" -ls | head
1384434 128 -rwxr-xr-x 1 yuehua yuehua 128370 Oct 31 11:11 ./technical/911report/chapter-7.txt
1384439 24 -rwxr-xr-x 1 yuehua yuehua 24112 Oct 31 11:11 ./technical/biomed/1468-6708-3-1.txt
1384440 32 -rwxr-xr-x 1 yuehua yuehua 29585 Oct 31 11:11 ./technical/biomed/1468-6708-3-10.txt
1384441 20 -rwxr-xr-x 1 yuehua yuehua 16882 Oct 31 11:11 ./technical/biomed/1468-6708-3-3.txt
1384442 32 -rwxr-xr-x 1 yuehua yuehua 31378 Oct 31 11:11 ./technical/biomed/1468-6708-3-4.txt
1384443 20 -rwxr-xr-x 1 yuehua yuehua 18114 Oct 31 11:11 ./technical/biomed/1468-6708-3-7.txt
1384444 24 -rwxr-xr-x 1 yuehua yuehua 24028 Oct 31 11:11 ./technical/biomed/1471-2091-2-10.txt
1384445 36 -rwxr-xr-x 1 yuehua yuehua 35103 Oct 31 11:11 ./technical/biomed/1471-2091-2-11.txt
1384446 28 -rwxr-xr-x 1 yuehua yuehua 24851 Oct 31 11:11 ./technical/biomed/1471-2091-2-12.txt
1384447 28 -rwxr-xr-x 1 yuehua yuehua 27970 Oct 31 11:11 ./technical/biomed/1471-2091-2-13.txt
the -newer option finds all files that were modified after the reference file.
##finding all files newer than a random file i chose
[yuehua@fedora docsearch]$ find ./technical/ -newer technical/plos/journal.pbio.0020035.txt -ls | head
1385568 0 drwxr-xr-x 1 yuehua yuehua 9696 Oct 31 11:11 ./technical/plos
1385577 12 -rwxr-xr-x 1 yuehua yuehua 10153 Oct 31 11:11 ./technical/plos/journal.pbio.0020042.txt
1385578 20 -rwxr-xr-x 1 yuehua yuehua 20221 Oct 31 11:11 ./technical/plos/journal.pbio.0020043.txt
1385579 20 -rwxr-xr-x 1 yuehua yuehua 19069 Oct 31 11:11 ./technical/plos/journal.pbio.0020046.txt
1385580 8 -rwxr-xr-x 1 yuehua yuehua 5847 Oct 31 11:11 ./technical/plos/journal.pbio.0020047.txt
1385581 16 -rwxr-xr-x 1 yuehua yuehua 15002 Oct 31 11:11 ./technical/plos/journal.pbio.0020052.txt
1385582 24 -rwxr-xr-x 1 yuehua yuehua 21038 Oct 31 11:11 ./technical/plos/journal.pbio.0020053.txt
1385583 20 -rwxr-xr-x 1 yuehua yuehua 20355 Oct 31 11:11 ./technical/plos/journal.pbio.0020054.txt
1385584 8 -rwxr-xr-x 1 yuehua yuehua 6873 Oct 31 11:11 ./technical/plos/journal.pbio.0020063.txt
1385585 20 -rwxr-xr-x 1 yuehua yuehua 16977 Oct 31 11:11 ./technical/plos/journal.pbio.0020064.txt
##creating a new file, then finding all files newer than it (we should expect nothing).
[yuehua@fedora docsearch]$ touch yeehaw.txt
[yuehua@fedora docsearch]$ find ./technical/ -newer yeehaw.txt
[yuehua@fedora docsearch]$