Cannot implicitly convert type string to int

Question

    Console.WriteLine ("Please enter some numbers");
        int sum = 0;
        for(;;)
        {
            string input = Console.ReadLine ();
            if (string.IsNullOrEmpty (input))
            {
                break;
            }
            int inputParsed = int.Parse (input.ToString ());
            int sumParsed = int.Parse (sum.ToString ());
            sum = sum + input; // throws an error here

            Console.WriteLine (sum);

I want my programme to show the sum of all numbers entered by user, by even though I have parsed all the variables needed, it throws an "cannot implicitly convert type 'string' to 'int'" error. What's wrong?

Answer 1

sum = sum + input; //throws an error here

should be:

sum = sum + inputParsed ;

You are using the original input instead of the parsed value. And you don't need sumParsed because you just keep the total sum in sum and you do no need to cast the int to a string and then parse it back to an integer.

Answer 2

to check if the input of the user is right i would prefer

int userInput = 0;
if( int.TryParse( input, out userInput ) == false )
{
     break;
}

This is just an advise and not directly a solution to your problem. There are enough answers =)