C looping through an array

Question

I am looping through an array of strings  such as  1 12 1992 apple truck 12 10 10 orange bicycle   The array s length will always be divisible by 3  I need to loop through the array and grab the first 3 items  I m going to insert them into a DB  and then grab the next 3 and so on and so forth until all of them have been gone through     iterate the array for  int i   0  i  lt  theData Length  i            grab 3 items at a time and do db insert  continue until all items are gone   theData  will always be divisible by 3

User · Accepted Answer

Just increment i by 3 in each step     Debug Assert  theData Length   3     0        theData  will always be divisible by 3    for  int i   0  i  lt  theData Length  i    3               grab 3 items at a time and do db insert             continue until all items are gone          string item1   theData i 0          string item2   theData i 1          string item3   theData i 2             use the items       To answer some comments  it is a given that  theData Length is a multiple of 3 so there is no need to check for theData Length-2 as an upperbound  That would only mask errors in the preconditions

User · Answer

Your for loop doesn t need to just add one   You can loop by three   for int i   0  i  lt  theData Length  i  3      string value1   theData i     string value2   theData i 1     string value3   theData i 2       Basically  you are just using indexes to grab the values in your array   One point to note here  I am not checking to see if you go past the end of your array   Make sure you are doing bounds checking

User · Answer

i   is the standard use of a loop  but not the only way  Try incrementing by 3 each time    for  int i   0  i  lt  theData Length - 2  i  3                      use theData i   theData i 1   theData i 2

User · Answer

Here is a more general solution   int increment   3  for int i   0  i  lt  theData Length  i    increment       for int j   0  j  lt  increment  j               if i j  lt  theData Length               theData i   j  for the current index

User · Answer

Not too difficult  Just increment the counter of the for loop by 3 each iteration and then offset the indexer to get the batch of 3 at a time   for int i 0  i  lt  theData Length  i  3        var item1   theData i       var item2   theData i 1       var item3   theData i 2       If the length of the array wasn t garuanteed to be a multiple of three  you would need to check the upper bound with theData Length - 2 instead

User · Answer

string   friends   new string 4   friends 0    quot ali quot   friends 1    quot Mike quot   friends 2    quot jan quot   friends 3    quot hamid quot    for  int i   0  i  lt  friends Length  i          Console WriteLine friends i     Console ReadLine

User · Answer

This should work     iterate the array for  int i   0  i  lt  theData Length  i  3          grab 3 items at a time and do db insert  continue until all items are gone   theData  will always be divisible by 3      var a   theData i       var b   theData i   1       var c   theData i   2       I ve been downvoted for this answer once   I m pretty sure it is related to the use of theData Length for the upperbound   The code as is works fine because array is guaranteed to be a multiple of three as the question states   If this guarantee wasn t in place  you would need to check the upper bound with theData Length - 2 instead

[c#] C# looping through an array

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