When dividing (an element of a string made up of digits) by a digit, it always outputs 0. And if you try to calculate the remainder of the division using "%", then it outputs the same figure.

 static void Main(string[] args)
    {
        Console.Write("Введите N: ");
        int N = Convert.ToInt32(Console.ReadLine());

        string str = "",STR = "";

        Console.WriteLine(" Числа меньше N, делящиеся на каждую из своих цифр: ");
        for (int i = 1; i < N; i  )
        {
             STR =""   i;

            for (int j = 0; j < STR.Length; j  )
            {
                if (i % STR[j] == 0)
                {
                    str  = STR[j];

                    if (str.Length == STR.Length)
                    {
                       Console.Write(str.ToString() ", ");
                    }
                }
                if ( i % STR[j] != 0) 
                {  break; }
            }
            str = "";
        }
    } 

I don't understand why it doesn't work..

CodePudding user response：

You are dividing an integer by a string when doing i % STR[j]. That can't work. Be sure to divide and % by integers.

CodePudding user response：

public static void Main()
{
    var maxNumber = 20;

    // Let's get a range of numbers that can be enumerated
    var range = Enumerable.Range(1, maxNumber);

    // Let's get from the range only items that comply with a condition
    // The condition here is a simple function
    // that returns true or false
    var result = range.Where(e => CheckNumber(e));

    // Let's combine the result string
    var resultString = string.Join(", ", result);
    Console.WriteLine(" Числа меньше N, делящиеся на каждую из своих цифр: ");
    Console.WriteLine(resultString);
}

public static bool CheckNumber(int n)
{
    // The task is to check the divisibility

    // Let's convert the number into a sting
    // your way of ""   i; is good but let's use a standart approach
    var str = n.ToString();

    // Bearing in mind that a string consists of chars that can be enumerated
    // let's filter it.
    // We don't take zeroes to avoid division by zero exception
    // and check whether our n is divided without a remeinder or not
    var nonDivisible = str.Where(e => int.Parse(e.ToString()) > 0 && (n % int.Parse(e.ToString())) != 0);

    // If the filtered data is empty,
    // our number comply with the rules,
    // and we return true. false otherwise
    return nonDivisible.Count() == 0;
}