I am writing a program that first lets a user enter a number between 1 and 10, and then checks what numbers between 1 and 1000 are dividable by that number. both variables used are int variables, so for example if a user enters 4, it should read: 1 8 12 16 etc.

thusfar i have the following code:

        private void button1_Click(object sender, EventArgs e)
        {
            int Getal1 = 1;
            int Getal2;

            Getal2 = int.Parse(textBox1.Text);//textbox1 to getal2

            for (Getal1 = 1; Getal1 <= 1000; Getal1  )//// for loop.
            {
                textBox2.Text = textBox2.Text   "\r\n"   Getal1 / Getal2    "\r\n";
            }
        }

the textbook mentions using the following code : Getal1 % Getal2.. i tried adding it after the calculation above, but this didnt work.. math is not my strong point at all.. does someone have an explanation on this? maybe if Getal1 % Getal2 = 0??.. im really guessing here..

thanks for any help in advance,

Stefan

I tried adding code from the textbook, expecting the program to work correctly, right now it does give a result, but not a correct result.. for example if i enter 2 it starts the sequence with the numbers 123..

CodePudding user response：

for (Getal1 = 1; Getal1 <= 1000; Getal1  )//// for loop.
        {
            if (Getal1 % Getal2 == 0)
            {
                textBox2.Text  = Getal1.ToString()   Environment.NewLine;
            }
        }

CodePudding user response：

You can omit the division checking whatsoever by starting with the number introduced by the user and then adding this number in the loop. This way you will never get a number that is not dividable.

For example:

1. if user inputs 4, you start with 4
2. than you add 4 to it and get 8
3. add 4 again, get 12 and so on

        private void button1_Click(object sender, EventArgs e)
        {
            int Getal2 = int.Parse(textBox1.Text);//textbox1 to getal2

            for (int Getal1 = Getal2; Getal1 <= 1000; Getal1  = Getal2)//// for loop.
            {
                textBox2.Text  = Getal1   "\r\n";
            }
        }