Error Index was outside the bounds of the array

Question

I m aware of what the issue is stating but I am confused to how my program is outputting a value that s outside of the array    I have an array of ints which is 0 - 8 which means it can hold 9 ints  correct  I have an int which is checked to make sure the users input value is 1-9  I remove one from the integer  like so   if  posStatus intUsersInput-1     0    if pos is empty       posStatus intUsersInput-1     1      set it to 1   then I input 9 myself and I get the error  It should access the last int in the array  so I don t see why I m getting an error   Relevant code   public int   posStatus          public UsersInput                 this posStatus   new int 8          int intUsersInput   0    this gets try parsed   validated that it s 1-9      if  posStatus intUsersInput-1     0    if i input 9 it should go to 8                posStatus intUsersInput-1     1    set it to 1          Error    Index was outside the bounds of the array    Index was outside the bounds of the array

User · Answer

if i input 9 it should go to 8   You still have to work with the elements of the array   You will count 8 elements when looping through the array  but they are still going to be array 0  - array 7

User · Answer

public int   posStatus          public UsersInput                   It means postStatus will contain 9 elements from index 0 to 8       this posStatus   new int 9         int intUsersInput   0      if  posStatus intUsersInput-1     0    if i input 9  it should go to 8                posStatus intUsersInput-1     1    set it to 1

User · Answer

You have declared an array that can store 8 elements not 9   this posStatus   new int 8      It means postStatus will contain 8 elements from index 0 to 7

[c#] Error : Index was outside the bounds of the array.

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