Can anybody tell me how can i sort elements of an integer array in descending order? is it possible?
thank you
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1Why do you think it isn't possible ? Have you googled on the question regarding the ways of doing it?Mahesh– Mahesh2011-03-08 19:48:37 +00:00Commented Mar 8, 2011 at 19:48
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3Is this homework? What have you tried already? Did you search?msarchet– msarchet2011-03-08 19:48:42 +00:00Commented Mar 8, 2011 at 19:48
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7 Answers
To sort it in-place, you can use the overload that accepts a comparison delegate:
Array.Sort(arr, (x,y)=>y.Compare(x));
Comments
Use Array.Sort:
Array.Sort(myArray, (a, b) => b.Compare(a));
Comments
myIntArray = myIntArray.OrderBy(i => -1 * i).ToArray();
or
myIntArray = myIntArray.OrderByDescending(i => i).ToArray();
or
Array.Sort(myIntArray, (x,y) => x.Compare(y) * -1);
Comments
Use Sort() followed by Reverse()
3 Comments
KeithS
Though this works, there are sorting overloads that don't require reversing.
Justin Skiles
My intention with this answer was to provide the simplest (but not best) solution. The OP was asking such a basic question that I was afraid to throw lambdas into the mix.
Jim Mischel
Although I know that efficiency isn't really a concern in this particular instance, it's interesting to note that for primitive types,
Sort() followed by Reverse() will execute almost three times as fast as calling Sort with a comparison delegate. See informit.com/guides/content.aspx?g=dotnet&seqNum=781 for the reasons why.This may help if you have a class assignment and your professor doesn't want you to use Array.Sort.
private void button1_Click(object sender, EventArgs e)
{
int[] numbers = { 7, 4, 2, 6, 1, 10, 5, 8, 9, 3 };
SortArray(numbers);
foreach (int n in numbers)
{
textBox1.Text = textBox1.Text + n.ToString() + ' ';
}
}
public static void SortArray(int[] num)
{
int temp;
int count = 0;
while (count < num.Length - 1)
{
int min = num[count];
for (int x = count; x < num.Length; x++)
{
if (min > num[x])
{
temp = num[count];
min = num[x];
num[count] = num[x];
num[x] = temp;
}
}
count++;
}
}
Comments
Try the following:
Array.Sort(array, (x, y) => y.Compare(x));
