从单行给出的控制台读取数字，用空格分隔

Question

I have a task to read n given numbers in a single line , separated by a space ( ) from the console.

I know how to do it when I read every number on a separate line ( Console.ReadLine() ) but I need help with how to do it when the numbers are on the same line .

Answer 1

You can use String.Split . You can provide the character(s) that you want to use to split the string into multiple. If you provide none all white-spaces are assumed as split-characters(so new-line, tab etc):

string[] tokens = line.Split(); // all spaces, tab- and newline characters are used

or, if you want to use only spaces as delimiter:

string[] tokens = line.Split(' ');

If you want to parse them to int you can use Array.ConvertAll() :

int[] numbers = Array.ConvertAll(tokens, int.Parse); // fails if the format is invalid

If you want to check if the format is valid use int.TryParse .

Answer 2

You can split the line using String.Split() :

var line = Console.ReadLine();
var numbers = line.Split(' ');
foreach(var number in numbers)
{
    int num;
    if (Int32.TryParse(number, out num))
    {
        // num is your number as integer
    }
}

Answer 3

You can use Linq to read the line then split and finally convert each item to integers:

  int[] numbers = Console
        .ReadLine()
        .Split(new Char[] {' '}, StringSplitOptions.RemoveEmptyEntries)
        .Select(item => int.Parse(item))
        .ToArray();

Answer 4

You simply need to split the data entered.

string numbersLine = console.ReadLine();

string[] numbers = numbersLine.Split(new char[] { ' '});

// Convert to int or whatever and use

Answer 5

This will help you to remove extra blank spaces present at the end or beginning of the input string.

string daat1String = Console.ReadLine();
daat1String = daat1String.TrimEnd().TrimStart();
string[] data1 = daat1String.Split(null);
int[] data1Int = Array.ConvertAll(data1, int.Parse);

Answer 6

you can do

int[] Numbers  = Array.ConvertAll(Console.ReadLine().Split(' '),(item) => Convert.ToInt32(item));

the above line helps us get individual integers in a Line , separated by a Single space .Two Or More spaces between numbers will result in error.

int[] Numbers = Array.ConvertAll(Console.ReadLine().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries), (item) => Convert.ToInt32(item));

this variation will Fix the error and work well even when two or more spaces between numbers in a Line

Answer 7

you can use this function, it's very helpful

    static List<string> inputs = new List<string>();
    static int input_pointer = 0;

    public static string cin(char sep = ' ')
    {
        if (input_pointer >= inputs.Count)
        {
            string line = Console.ReadLine();

            inputs = line.Split(sep).OfType<string>().ToList();
            input_pointer = 0;
        }

        string v = inputs[input_pointer];
        input_pointer++;

        return v;
    }

Example:

        for(var i =0; i<n ; i++)
            for (var j = 0; j<n; j++)
            {
                M[i,j] = Convert.ToInt16(cin());
            }