Question Resistor color code

[Pavle]

I made resistor app that calculates resistance from colors but I don't know how to make app that coverts resistance to color.Can you help me make this?

 

[Pavle]

private void button1_Click(object sender, EventArgs e)
{
    if (comboBox1.Text == "4")
    {
        if (textBox1.Text == "0")
        {
            MessageBox.Show("Otpornost mora biti veca od nule!", "Otpornost", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        if(comboBox2.Text=="")
        {
            MessageBox.Show("Izaberi vrednost tolerancije!", "Otpornost", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        var colours = new string[] { "Black", "Brown", "Red", "Orange", "Yellow", "Green", "Blue", "Violet", "Grey","White", "Silver", "Gold" };
        var factorDictionary = new Dictionary<char, double>() { { 'p', 0.000000000001 }, { 'n', 0.000000001 }, { 'u', 0.000001 }, { 'm', 0.001 }, { 'R', 1 }, { 'K', 1000 }, { 'M', 1000000 }, { 'G', 1000000000 } };
        string res = string.Empty;

        while (string.IsNullOrEmpty(res))
        {
            res = textBox1.Text;
        }

        var lastChar = res.Last();
        var isUnitCorrect = factorDictionary.ContainsKey(lastChar);
        var value = res.Substring(0, res.Length - 1);
        var isValueCorrect = !value.Any(x => !char.IsDigit(x));

        if (isUnitCorrect && isValueCorrect)
        {
            double mul = factorDictionary[lastChar];
            double val = double.Parse(value) * mul;
            int third = 0;

            if (val < 0.1)
            {
                MessageBox.Show("Otpornost ne moze da bude manja od 0.1 oma!", "Otpornost", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            if (val < 1)
            {
                val *= 100;
                third = 10;
            }
            else if (val < 10)
            {
                val *= 10;
                third = 11;
            }

            res = val.ToString();

            if (res.Count() > 24)
            {
                MessageBox.Show("Pogresna vrednost!", "Otpornost", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            else
            {
                label15.BackColor = Color.FromName(colours[res[0] - '0']);
                label16.BackColor = Color.FromName(colours[res[1] - '0']);
                label17.BackColor = Color.FromName(colours[third != 0 ? third : res.Count() - 2]);
                label6.Text = textBox1.Text;
                textBox2.Text = colours[res[0] - '0'];
                textBox3.Text = colours[res[1] - '0'];
                textBox4.Text = colours[third != 0 ? third : res.Count() - 2];
            }
            if (comboBox1.Text == "4")
            {
                if (comboBox2.Text == "E24 (5%)")
                {
                    label18.BackColor = Color.Gold;
                    textBox5.Text = "Gold";
                }
                if (comboBox2.Text == "E12 (10%)")
                {
                    label18.BackColor = Color.Silver;
                    textBox5.Text = "Silver";
                }
            }
        }
        else
        {
            MessageBox.Show("Invalid value!", "Otpornost", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
}

 

[Pavle]

How to show closest standard value and closest standard color for resistor?

 

[Pavle]

How to show closest standard value and closest standard color for resistor?

 

[jmcilhinney]

How to show closest standard value

It doesn't seem to me that you're putting any effort into this yourself. If I gave you a list of numbers and asked you which of them another specific number was closest to then I'm confident that you could tell me. If you can do that then you can answer your own question here. I'm done with this thread.