c# - 控制台应用程序 C# 循环

Question

大家好，我正在学习成为一名程序员，这是我正在从事的一个项目。控制台基本上接受用户输入(直径)并告诉您将获得多少披萨片以及每片的面积。在告诉他们每个切片和面积之后，它必须提示新的输入。切片是根据范围确定的，例如 12 - 20"的直径 = 8 个切片。用户必须输入 12"- 36"之间的范围，否则会收到错误消息。此外，如果用户输入的直径为 36，它必须以 4 的减量显示所有其他切片，因此 24 、 20 、 16 、 12 、 8 。但是如果直径最终落在 8 个切片以下，它必须只显示那个。因此 12 个切片将显示 8 个切片并且12 片。

最后，我们正在学习循环，我们将在这个项目中使用 do while 循环和 for 循环。

这是我的，但它不起作用。

        //DECLARATIONS
        double circleArea;  // area of pizza
        double diameter; // diameter of the pizza
        double areaOfSlice; // area of the slices
        double radius; // half the diameter of the pizza
        double slices = 0; // number of pizza slices
        string message = ""; // a string to hold a message to the user
        const int DIAMETER_RANGE_MASSIVE = 36;
        const int DIAMETER_RANGE_EXTRA_LARGE = 30;
        const int DIAMETER_RANGE_LARGE = 24;
        const int DIAMETER_RANGE_MED = 16;
        const int DIAMETER_RANGE_LOW = 12; // Low end on range scale for diameter
        const int SLICES_LOW_DIAMETER = 8; // number of pizza slices based on diameter
        const int SLICES_MID_DIAMETER = 12; // number of pizza slices based on diameter
        const int SLICES_HIGH_DIAMETER = 16; // number of pizza slices based on diameter
        const int SLICES_GIANT_DIAMETER = 24; // number of pizza slices based on diameter        
        bool needInput = true;
        const int END_PROGRAM = 0;




        // INPUT
        // Prompt for and get keyboard input

        Console.Write("Please enter the diameter of your pizza (0 to end program): ");  // get user to input diameter
        diameter = Convert.ToDouble(Console.ReadLine()); // read a line of text (string) from the keyboard,
        // convert that string to an double,
        // assign the resulting value to diameter

        // PROCESSING
        // determine if diameter meets requirements of 12" to 36"
        // if does not meet requirements show error message and have user enter in new diameter
        do
        {
            if (diameter < DIAMETER_RANGE_LOW || diameter > DIAMETER_RANGE_MASSIVE)

            {
                message = "\nENTRY ERROR";
                message += "\nPizza must have a diameter in the range of 12” to 36” inclusive!";
                message += "\nPlease try again.";
            }



        else {    
            needInput = false;
                // determine the number of slices based on diameter


                if (diameter >= DIAMETER_RANGE_LOW && diameter < DIAMETER_RANGE_MED)
                {
                    slices = (SLICES_LOW_DIAMETER);
                }
                else if (diameter < DIAMETER_RANGE_LARGE)
                {
                    slices = (SLICES_MID_DIAMETER);
                }
                else if (diameter < DIAMETER_RANGE_EXTRA_LARGE)
                {
                    slices = (SLICES_HIGH_DIAMETER);
                }
                else
                {
                    slices = (SLICES_GIANT_DIAMETER);
                }

                Console.Clear(); // clears console to show new output lines
                //OUTPUT
                for (int slicesAddFour = 8; slicesAddFour <=slices; slicesAddFour+=4) // for each slices
                {
                // determine the area of the slices
                radius = diameter / 2; // uses diameter to get radius
                circleArea = Math.PI * Math.Pow(radius, 2); // uses math class to calculate circle area  
                areaOfSlice = Math.Round((circleArea / slices), 2); // divides circle area by slices, takes the result of above calculation and rounds

                Console.WriteLine("\nA {0}\" Pizza diameter: {0}\".", diameter); 
                message +=("\n==============================================");
                Console.WriteLine("\nCut in {0} slices results in an area of {1}\" per slice.",areaOfSlice,slices);

                }


        } //end of else

            message = ("\nPlease enter the diameter of your pizza (0 to end program)");
            needInput = true;
        } while (diameter != END_PROGRAM && needInput);
    }
}

Answer 1

你的问题是你读入了一次数据，然后继续循环而没有得到任何新数据。如果你移动

Console.Write("Please enter the diameter of your pizza (0 to end program): ");  // get user to input diameter
diameter = Convert.ToDouble(Console.ReadLine()); // read a line of text (string) from the keyboard,

在循环内部，它应该可以解决您的问题