Error 1 An object reference is required for the non-static field, method, or property 'temperature_conversion.Program.Celsius(int)'

Question

class Program
    {
        static void Main(string[] args)
        {
            int temp;
            string choice;
            int finalTemp;
            Console.WriteLine("Enter a temperature");
            temp = Convert.ToInt16(Console.ReadLine());

            Console.WriteLine("Convert to Celsius or Fahrenheit?" + "\n" +"Enter c or f");
            choice = Console.ReadLine();

            if (choice == "c")
            {
                Celsius(temp);
            }



            Console.ReadLine();//to keep open

        } //Main End

        public int Celsius(int t)
        {
            int c;
            c = 5 / 9 * (t - 32);
            return c;
        }
    }

I know the answer is really simple I just can't seem to figure out what I have done wrong.

I'm trying to pass temp to the Celsius method.

Answer 1

将您的方法标记为静态：

public static int Celsius(int t)

Answer 2

The problem is that the Celsius method is not Static, like Main .

You could resolve this 2 ways.

Make Celsius static:

public static int Celsius(int t)

Create an instance of the Program and then call Celsius :

var program = new Program();   
program.Celsius(temp);

Answer 3

Try with static method of your Celcuis method. If you want to call a method in the same class with your caller method and if you want to call directly you should use static keyword on your method. Like this;

static public int Celsius(int t)
{
    int c;
    c = 5 / 9 * (t - 32);
    return c;
}

For other option, you can create a class instance and call your method in your if condition. Like this;

if ( choice == "c" )
{
   Program p = new Program();
   p.Celsius(temp);
}

Answer 4

One possibility is to make the Celsius method static public static int Celsius(int t) .
Another, is to create a new instance of Program and call Celsius on it:

new Program().Celsius(temp);