[Solved] What can I do to make my program work?

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You are missing the closing curly brace (}) at the end of this loop.

foreach (string s in tokens)
{
    if (double.TryParse(s, out oneNum))
    {
        nums.Add(oneNum);
    }
    else
    {
        Console.WriteLine("You have inputed invalid number, please try again!");   
        break;
    }

Without that closing brace, all the following calculations are considered to be inside that loop! Since the code includes a call to Console.ReadLine(), it looks like you’ve finished the calculations when you’ve only gone through the first iteration of the loop.

solved What can I do to make my program work?