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        Random rnd = new Random();

        int[] numbeo = new int[100];

        for (int index = 0; index <= numbeo.GetLength(0) - 1; index++)
        {
            numbeo[index] = rng.Next(100);
            Console.WriteLine(numbeo[index]);
        }

I have worked with a company called funtech and the are string to show me how to do arrays in c# i understand it very well but the only thing I do not understand is when I need to to numbeo.GetLength - 1 why do i need to minus one.

I am thinking it is to do with this lets say for example I have an array of random numbers:

59, 64, 53, 4, 89. 0, 1, 2, 3, 4.

I am thinking when your try and use -1 it moves all the values backwards so now it does this.

59, 64, 53, 4, 89. 1, 2, 3, 4, 5.

Am I correct with this

No, it has nothing to do with the generated values. Arrays in C# are zero-based, meaning, that the first index of an array is 0.

string[] elements = new string[3]; // String array with 3 elements, indexes: 0, 1, 2
elements[0] = "Firt element"; // Ok
elements[1] = "Second element"; // Ok
elements[2] = "Third element"; // Ok
elements[3] = "Out of bounds"; //Throws an error

The .GetLength(0) method says that give me the length of the first dimension (0 is the first in dimensions). In 1 dimensional arrays, this is the same as .Length.

Console.WriteLine(elements.GetLenght(0)); // Prints 3 to console
Console.WriteLine(elements.Length); // Prints 3 to console

So you could use

numbeo.Length

The -1 is because the for loop uses less or equal condition, in your case. The for loop goes from 0 to 100, because your numbeo array's size is 100. And because 100 is the first invalid index in this array, you have to subtract 1, to go only to 99. In short, this is overcomplicated, use < instead of <=, and use .Length instead of GetLength(0)

    for (int index = 0; index < numbeo.Length; index++)
    {
        numbeo[index] = rng.Next(100);
        Console.WriteLine(numbeo[index]);
    }

This forloop goes from 0 to 99 (both ends inclusive), which are the exact valid range of this array's indexes.

Index was out of bounds of array? c# forms, arrays are 0 indexed, that means that an array with 3 elements will have elements at indexes 0 , 1 , and 2 . 3 is out of bounds, so when you try to  Arrays in C# are zero-based, meaning, that the first index of an array is 0. string[] elements = new string[3]; // String array with 3 elements, indexes: 0, 1, 2 elements[0] = "Firt element"; // Ok elements[1] = "Second element"; // Ok elements[2] = "Third element"; // Ok elements[3] = "Out of bounds"; //Throws an error.

An arrays length always return depend on its size but index value always start with zero.

Exmaple : If you create an array int[] numbeo = new int[100] then length function will return length of 100 and array does not have 100 index value as it start with zero.

Console.Write("length :"+numbeo.GetLength(0)); 

IndexOutOfRangeException Class (System), So, what's so wonderful? You just have two array with different lengths. You index range goes outside one of the arrays. OK, I feel my previous  What if programmer accidentally accesses any index of array which is out of bound ? C don’t provide any specification which deal with problem of accessing invalid index. As per ISO C standard it is called Undefined Behavior .

Its because the first index of the array is zero. So if your array is empty, then we can say it contains 0 elements and its length is also 0. If the array has 1 element in 0 index its length is 1. If the array has 2 elements, its length is 2 and so on and so forth. However, there are some languages where the index of an array starts at 1 not 0 (e.g. Fortran, Matlab, Smalltalk) but here we are talking about c#.

[Solved] Index was outside the bounds of the array. in c#, An array element access that is not in range causes this. C# program that accesses array out of bounds class Program { static void Main() { // Allocate an array  C# program that accesses array out of bounds class Program { static void Main() {// Allocate an array of one-hundred integers. // Then assign to positions in the array. // Assigning past the last element will throw. int[] array = new int[100]; array[0] = 1; array[10] = 2; array[200] = 3;} } Output Unhandled Exception: System.

Try this

    Random rnd = new Random();

    int[] numbeo = new int[100];

    for (int index = 0; index < numbeo.Length  ; index++)
    {
        numbeo[index] = rng.Next(100);
        Console.WriteLine(numbeo[index]);
    }

C# IndexOutOfRangeException, Read Next. gary_woodfine profile image. The Prototype Design Pattern C# .net core. Gary Woodfine - Oct 28 '19. throw new System.ArgumentOutOfRangeException("index parameter is out of range.", e); } } } Comments. The code that causes an exception is enclosed in the try block. A catch statement is added immediately after to handle IndexOutOfRangeException, if it occurs.

how to fix Index was outside the bounds of the array error?, Generally, an array is of fixed size and each element is accessed using the indices. For example, we have created an array with size 9. An IndexOutOfRangeException exception is thrown when an invalid index is used to access a member of an array or a collection, or to read or write from a particular location in a buffer. This exception inherits from the Exception class but adds no unique members.

How to handle Java Array Index Out of Bounds Exception?, The array index out of bounds error is a special case of the buffer overflow error. It occurs when the index used to address array items exceeds the allowed value​  Whenever you used an –ve value or, the value greater than or equal to the size of the array, then the ArrayIndexOutOfBoundsException is thrown. For Example, if you execute the following code, it displays the elements in the array asks you to give the index to select an element. Since the size of the array is 7, the valid index will be 0 to 6.

Array index out of bounds, Check the following : 1. Is the int parameter arg being reinitialized somewhere in the method ? if not, may be consider making it final so as to avoid a red herring  If a request for a negative or an index greater than or equal to the size of the array is made, then the C# throws an System.IndexOutOfRange Exception. This is unlike C/C++ where no index of the bound check is done. The IndexOutOfRangeException is a Runtime Exception thrown only at runtime.

Comments
  • Because the first index is 0, not 1. index <= numbeo.GetLength(0) - 1; is normally done as index < numbeo.Length; to avoid the need for the -1.
  • Cheers for that it is very helpful and yours (sorry to the rest of you but our ones were still good), has been the best way of it shown to me so far I have been shown a by a company called funtech on how to do this. I am also only a student, so it will take me a while to understand this
  • this does work but I do not undertans what this means
  • This loop iterates the array from index 0 to the index of the (length of the array - 1)
  • in your case index <= numbeo.GetLength(0) - 1 should be changed to index < numbeo.GetLength(0) - 1 (Remove the equal sign)
  • Sorry.. My bad it should be changed to index <= numbeo.GetLength(0)
  • I think you mean index < numbeo.GetLength(0)?