This question already has answers here:
What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
(5 answers)
Closed 3 years ago.
I am learning C#. I know how to do this in C++ but i get an exception to this line of code :
v[i] = int.Parse(Console.ReadLine());
System.IndexOutOfRangeException: 'Index was outside the bounds of the array.'
int[] v = new int[n];
for (int i = 1; i <= n; i++)
{
v[i] = int.Parse(Console.ReadLine());
}
I want to translate this from C++ to C#:
int v[1001], n;
cin>>n;
for (int i = 1; i <= n; i++)
{
cin>>v[i];
}
There is more code but i think it's irelevant for this problem.
Just to add the code which will work, alongside Christos' explanation.
Solution: Now you're also starting the loop at 0 which will not result in an exception and you won't skip the first element.
Note that here you have < not <=. That's because the last element in the array has an index of n-1.
int[] v = new int[n];
for (int i = 0; i < n; i++)
{
v[i] = int.Parse(Console.ReadLine());
}
As already mentionend, for a detailed explanation/comparison(between c++ and c#) on this see Christos' answer.
Related
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Closed 1 year ago.
Here is my code below-
double[][] geometricReturnsArray = new double[returnsArray.Count][];;
double[] tempGeometricReturns = new double[returnsArray[0].Count];
double return_1 = 0;
double return_2 = 0;
for (int i = 0; i < returnsArray.Count; i++)
{
for (int j = 0; j < returnsArray[i].Count - 1; j++)
{
return_1 = returnsArray[i][j + 1];
return_2 = returnsArray[i][j];
tempGeometricReturns[j] = ((return_1 - return_2) / return_2) * 100;
}
geometricReturnsArray[i] = tempGeometricReturns;
}
The issue I'm facing in the code is that tempGeometricReturns keeps getting reassigned as i increases. So in the end, all three arrays of geometricReturnsArray have exactly the same values since when tempGeometricReturns gets reassigned, so do the previous values in geometricReturnsArray.
I tried to use lists as well but then I just get a long list of 267 values whereas I'd prefer three arrays of length 90. What else can I try to do?
In your example you will end up with multiple references to the same array in the geometricReturnsArray. Arrays are reference types, so assignments only copy the reference, not the entire array.
The fix is to create a new array for each outer loop, for example by copying the existing array when doing the assignment
}
geometricReturnsArray[i] = tempGeometricReturns.ToArray();
}
or
for (int i = 0; i < returnsArray.Count; i++)
{
double[] tempGeometricReturns = new double[returnsArray[0].Count];
for (int j = 0; j < returnsArray[i].Count - 1; j++)
{
This question already has answers here:
What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
(5 answers)
Closed 1 year ago.
I've been reading the Introduction to Algorithms and tried to implement the pseudocode, but I can't seem to pinpoint what is causing IndexOutOfRangeException.
Merge
The error happens at left[i] < right[j]
static void Merge(int[] array, int start, int middle, int end)
{
i = 1;
j = 1;
for (k = start; k < end; k++)
{
if (left[i] < right[j])
{
array[k] = left[i];
i = i + 1; // -> i++;
}
else
{
array[k] = right[j];
j = j + 1; // -> j++;
}
}
}
Solved
I solved it by setting all i and j variables to 0 and k to k = start - 1
You are getting error in this line:
if (left[i] < right[j])
since i exceeds left array length when it becomes 6 and array left has only 6 elements.
It is very easy to figure it out when you use debugging.
This question already has answers here:
What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
(5 answers)
Closed 2 years ago.
I have an array numArray with the length set to a value the user can put in. if arrayLength is 5 for example I want the for loop to count up by 1 to 5 [1,2,3,4,5]. My error is numArray[i] = sum + 1; (System.IndexOutOfRangeException: 'Index was outside the bounds of the array.')
int[] numArray = new int[arrayLength];
int sum = 0;
for (int i = 0; i <= arrayLength; i++)
{
Console.WriteLine(i);
numArray[i] = sum + 1;
}
Use i < arrayLength.
If i <= arrayLength at the last iteration i = 5 and you try to access numArray[5] which does not exists (you have only 5 indexes: 0 to 4 ).
Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 6 years ago.
Improve this question
//1. add 10 numbers in sequence , print only steam numbers.
int[] seq= new int[10];
int n = 0;
int[] seq2= new int[n];
for (int i = 0; i < seq.Length; i++)
{
Console.WriteLine("Add number ");
seq[i] = int.Parse(Console.ReadLine());
if (seq[i]%2==0)
{
seq2[n] = seq[i];
n++;
}
}
for (int i = 0; i < seq2.Length; i++)
{
Console.WriteLine(seq2[i]);
}
There is something wrong with sequence2 and the program isn't telling anything about it , can someone help ? it's not about the task i did it other way but i just want to understand what did i do wrong here .
You declared Seq2 array with length 0 in below shown part of your code. So it will always fail with Index was outside the bounds of the array exception when you do this seq2[n] = seq[i];.
int n = 0;
int[] seq2= new int[n];
Declare Seq2 as list instead. Like this..
var seq2= new List<int>();
and then do this..
seq2.Add(seq[i]);
Your final code will look like this..
int[] seq= new int[10];
var seq2= new List<int>();
for (int i = 0; i < seq.Length; i++)
{
Console.WriteLine("Add number ");
seq[i] = int.Parse(Console.ReadLine());
if (seq[i]%2==0)
{
seq2.Add(seq[i]);
}
}
for (int i = 0; i < seq2.Count(); i++)
{
Console.WriteLine(seq2[i]);
}
Since you don't know the number of elements in the second array, and C# doesn't have dynamic arrays (I think), just use a list instead:
int[] seq= new int[10];
int n = 0;
List<int> seq2= new List<int>;
for (int i = 0; i < seq.Length; i++)
{
Console.WriteLine("Add number ");
seq[i] = int.Parse(Console.ReadLine());
if (seq[i]%2==0)
{
seq2.Add(seq[i]);
n++;
}
}
for (int i = 0; i < seq2.Length - 1; i++)
{
Console.WriteLine(seq2[i]);
}
Are the arrays obligatory?
int n = 10;
for (int i = 0; i < n; i++)
{
Console.WriteLine("Add number ");
int a = int.Parse(Console.ReadLine());
if (a%2==0)
{
Console.WriteLine(a);
}
}
If they are, you will need a List because you don't know how many of them will be even.
Edit: just read the bottom line..
This question already has answers here:
What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
(5 answers)
Closed 7 years ago.
Can somebody help with this snippet of code which has an exception. It always stacks on [2,0] index. I just can't figure out how to solve this. I have added a screenshot below.
private Matrix GridToMatrix(DataGridView grid)
{
var matrix = new double[grid.RowCount, grid.ColumnCount];
for (int i = 0; i < grid.RowCount; i++)
{
for (int j = 0; j < grid.ColumnCount; j++)
{
matrix[i, j] = Convert.ToSingle(grid[i, j].Value);
}
}
return new Matrix(matrix);
}
The problem here is the confusing indexing mechanism of DataGridView.
The indexing for DataGridView is like [col, row] while Matrix indexing is [row, col]
By changing grid[i, j] to grid[j, i] the problem will resolve.