reverse

Using a for loop to reverse an array does nothing [duplicate]

纵饮孤独 提交于 2019-12-02 09:34:59
This question already has an answer here: Transpose matrix: swapping elements doesn't alter values 1 answer I am trying to reverse an array of 15 numbers by using a for loop, but for some reason the array order stays the same. My code looks like this: int main() { int arr[15] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }; int i, j, temp; for (i = 0; i < 15; i++) { temp = arr[15 - i - 1]; arr[15 - i - 1] = arr[i]; arr[i] = temp; } j = 0; do { std::cout << arr[j] << " "; j++; } while (j < 15); } Any idea what have I done wrong? Yes, you swap all the elements back again once i is past

Logic behind the Array.Reverse() method

微笑、不失礼 提交于 2019-12-02 08:40:06
what is the native logic work behind public static void Reverse(Array array, int index, int length); You can use .NET Reflector for that: [ReliabilityContract(Consistency.MayCorruptInstance, Cer.MayFail)] public static void Reverse(Array array, int index, int length) { if (array == null) { throw new ArgumentNullException("array"); } if ((index < array.GetLowerBound(0)) || (length < 0)) { throw new ArgumentOutOfRangeException((index < 0) ? "index" : "length", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); } if ((array.Length - (index - array.GetLowerBound(0))) < length) {

Trying to reverse a C++ array and at the same time store it into a new array

限于喜欢 提交于 2019-12-02 07:56:04
I'm trying to reverse an array and simultaneously store it in a new array with for loops. I have achieved it somewhat manually but not with loops. The first code below uses loops, the latter manually or literally. char wrd[26],rev[26]; int y,i,s; s=strlen(wrd)-1; for(y=0;y<s;y++) for(i=s;i>=0;i--) { rev[y]=wrd[i]; } Below is the same done manually; it works, but you get random chars used to fill the rest of the array: { char drw[26], wrd2[26]; int s,i=0; s=strlen(wrd2)-1; drw[0]=wrd2[s]; drw[1]=wrd2[s-1]; drw[2]=wrd2[s-2]; drw[3]=wrd2[s-3]; drw[4]=wrd2[s-4]; drw[5]=wrd2[s-5]; drw[6]=wrd2[s-6];

Undo reverse merge in Subversion, or double-reverse merge

▼魔方 西西 提交于 2019-12-02 07:30:34
问题 What is the best way to undo a committed reverse merge? Here's the scenario: I committed a change, say revision 100, which caused a regression. Since I was leaving for a few days and didn't have time to debug the issue, I reverse-merged 100 and committed revision 101. Now I'm ready to attack the issue again. I have three ideas for doing this, but I don't know what is best or even what will work: Reverse merge revision 101 Merge revision 100 Copy the changes made in 100 to my working copy

How to reverse the axis in ILNumerics

蹲街弑〆低调 提交于 2019-12-02 07:25:02
I want to reverse the Y axis in ILLinePlot from top to bottom (from descending become ascending). My result is like this: here is the code: scene.Add(new ILPlotCube { new ILLinePlot(ILMath.tosingle(ZDistance["1,0;:"]), markerStyle: MarkerStyle.Dot) }); How to reverse the Y axis become like this figure? Turn the plot cube around the X axis by 180°: ilPanel1.Scene.Add(new ILPlotCube { Children = { new ILLinePlot(ILSpecialData.sincos1Df(200,1)[":;0"].T) }, Rotation = Matrix4.Rotation(new Vector3(1,0,0), ILMath.pif) }); You may want to further configure the plots axes. 来源: https://stackoverflow

php page navigation by serial number

我们两清 提交于 2019-12-02 07:04:24
Can anyone help in this php page navigation script switch on counting normal serial number? In this script there is a var called "page_id" - I want this var to store the real page link by order like 0, 1, 2, 3, 4, 5 ... <? $onpage = 10; // on page /* $pagerecord - display records per page $activepage - current page $records - total records $rad - display links near current page (2 left + 2 right + current page = total 5) */ function navigation($pagerecord, $activepage){ $records = 55; $rad = 4; if($records<=$pagerecord) return; $imax = (int)($records/$pagerecord); if ($records%$pagerecord>0)

Undo reverse merge in Subversion, or double-reverse merge

烈酒焚心 提交于 2019-12-02 06:40:18
What is the best way to undo a committed reverse merge? Here's the scenario: I committed a change, say revision 100, which caused a regression. Since I was leaving for a few days and didn't have time to debug the issue, I reverse-merged 100 and committed revision 101. Now I'm ready to attack the issue again. I have three ideas for doing this, but I don't know what is best or even what will work: Reverse merge revision 101 Merge revision 100 Copy the changes made in 100 to my working copy without mergeinfo Any suggestions? Reverse merging revision 101 describes best what you're doing, ie

How can I reverse a section of a list using a loop in Python?

蹲街弑〆低调 提交于 2019-12-02 06:16:13
问题 I'm in need of a little help reversing a section of a list in Python using a loop. I have a list: mylist = ['a', 'b', 'c', 'd', 'e', 'f'] Also have an index number, this number will tell where to start the reversing. For example, if the reverse-index number is 3, it needs to be something like this: ['d', 'c', 'b', 'a', 'e', 'f'] What I currently have: def list_section_reverse(list1, reverse_index): print("In function reverse()") n_list = [] for item in range( len(list1) ): n_list.append(

Reverse a number without making it a string in Javascript [duplicate]

a 夏天 提交于 2019-12-02 05:24:41
问题 This question already has answers here : JavaScript: How to reverse a number? (8 answers) Closed last month . Can anyone show me where I'm going wrong in my code please? I'm trying to reverse a number without changing it to a string. I've been searching google and looked through the previous questions asked about this topic and from what I can see my code mirrors the other answers. I've only been able to find code in Java, C, or C++ that do not use the to string method. In my attempts, when I

String reverse using pointers

本秂侑毒 提交于 2019-12-02 04:29:07
I'm trying to reverse a string using pointers.When i try to print the reversed string instead of getting DCBA i'm getting out only as BA?Can anyone help me on this? #include<stdio.h> void reverse(char *); void main() { char str[5] = "ABCD"; reverse(str); } void reverse(char *str) { char *rev_str = str; char temp; while(*str) str++; --str; while(rev_str < str) { temp = *rev_str; *rev_str = *str; *str = temp; rev_str++; str--; } printf("reversed string is %s",str); } You're losing your pointer to the beginning of the string, so when you print it out you're not starting from the first character,