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I have an array of strings that has a number at the beginning, followed by a name. How can I sort the array numerically; ie
40 Mike, 25 Tyson, 9 Jackson, 5 Phillip, 3 Mitchell
as opposed to
9 Jackson, 5 Phillip, 40 Mike, 3 Mitchell, 25 Tyson
using System;
using System.Collections.Generic;
public class Test
{
public static void Main()
{
string[] items = {"10", "1", "30", "-5"};
Array.Sort(items, (x, y) =>
{
int xNum = int.Parse(x);
int yNum = int.Parse(y);
return Comparer<int>.Default.Compare(xNum, yNum);
});
foreach(var item in items)
Console.WriteLine(item);
}
}
var sorted = yourArray.OrderBy(x => int.Parse(x.Split()[0])).ToArray();
You can use SortedDictionary data structure to obtain an array sorted.
Related
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of course I can use for() {}
but is there any function which can add all values in array?
if do you know, please tell me.
thank you.
int[] a = new int[] { 1, 2, 3, 4, 5 };
int[] b = new int[a.Length];
a.CopyTo(b, 0);
b.ToList().ForEach(c=>{
System.Console.WriteLine(c);
});
using System.Linq;
then...
var array = new double[] { 1.1, 2.2, 3.3 };
var sum = array.Sum(value=>value);
Console.WriteLine($"Sum is {sum}");
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What will be the regular expression for value Range from 1 - 1440? (Integer)
I think this will do it. I'm running tests. I'm acting under the assumption you will not have numbers padded with zero like "0999"
"^([1-9]|[1-9][0-9]|[1-9][0-9][0-9]|1[0-3][0-9][0-9]|14[0-3][0-9]|1440)$"
breakdown:
[1-9] obvious
[1-9[0-9] allow 10 to 19
[1-9][0-9][0-9] allow 100 to 199
1[0-3][0-9][0-9] allow 1000 to 1399
14[0-3][0-9] allow 1400 to 1439
1440 obvious
Appears to work:
using System;
using System.Text.RegularExpressions;
public class Program
{
public static void Main()
{
for(int i = 0;i < 10000;i++)
{
if(Regex.IsMatch(i.ToString(),"^([1-9]|[1-9][0-9]|[1-9][0-9][0-9]|1[0-3][0-9][0-9]|14[0-3][0-9]|1440)$"))
{
Console.WriteLine(i);
}
}
}
}
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I want to implement a method with the following signature:
public int Max(int number){ }
The largest number that can be created by a digits of a given number is obtained by ordering the digits from largest to smallest. See the following code for a possible implementation.
public int Max(int number)
{
var numberAsCharArray = number.ToString().OrderByDescending(c => c).ToArray();
var largestNumberAsString = new string(numberAsCharArray);
return Int32.Parse(str);
}
Maybe not most efficient way is to cast to string and order desc
var result = int.Parse(String.Join("", digit.ToString().OrderByDescending(x => x)))
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I have two arrays -
int[] array1 = { 1, 2};
int[] array2 = { 6, 7};
I want to write them in text file delimited by tab.
Final Result -
1 6
2 7
Please suggest how to do this?
Assuming both arrays are of the same length:
File.WriteAllLines(filename,
Enumerable.Range(0, arr1.Length)
.Select(i => string.Format("{0}\t{1}", arr1[i], arr2[i]));
You could do something like this:
public void writeFile(int[] array){
using (streamWriter sw = new StreamWriter(filename, true){
for(int i = 0; i < array.Length; i++){
sw.WriteLine(array[i] + "\t");
}
}
}
Then you would just call the write method like this:
writeFile(array1);
writeFile(array2);
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public static int[] ddDuration()
{
int[] ddarray = new int[] { 1, 2, 3, 4, 5 };
return ddarray;
}
How to make in c# to call my int array to who any page in my DropDownList
//and I am try to show in my DropDownList
//like that some thing
Duration dm = new Duration();
//dm.ddDuration;
//dropdduration.item.AddRang(dm.ddDuration);
If I got this right, you're trying to add an array of integers as items to a DropDownList.
var collection = ddDuration();
int len = collection.length;
for(int i=0; i<len; i++){
DropDownList1.Items.Insert(i, new ListItem(collection[i].toString(), ""));
}
Insert's first parameter is the position (index) in the Items collection and the second parameter takes a ListItem; of which constructor can be build upon its content (string in this case).