从double转换为十进制 [英] cast from double to decimal

问题描述

       这可能是一个愚蠢的问题，但我无法施法，它一直告诉它不能表现，我知道  你通过将
放在你想要在括号前面使用的类型来投射一个值。对于double glassArea到decimal，它应该是（decimal）glassArea对吗？

        This is probably a silly question but i am having trouble casting it keeps telling that it cant perform, I know You cast a value by putting the type you want used in parenthesis just in front of it. For double glassArea to decimal it should be (decimal) glassArea right?

            int windowCost;

            int windowCount;

            int totalCost;

            decimal windowAreaCharge;



$
            windowCost = 0;

            windowCount = 0;

            totalCost = 0;

            windowAreaCharge = 9.49m;



$
           双倍宽度;

           双倍高度;

            double woodLength;

            double glassArea;

            string widthString;

            string heightString;

            string windowString;

$


            //读入宽度

            Console.WriteLine（"Plase输入以米为单位的宽度。"）;

            widthString = Console.ReadLine（）; //从用户那里获取价值

            width = double.Parse（widthString）; //将字符串转换为doubele



            //读入高度

            Console.WriteLine（"请输入以米为单位的高度。"）;

            heightString = Console.ReadLine（）;

            height = double.Parse（heightString）;



            //计算（width.I + height）* 2 * 3.25并转换为英尺

            woodLength = 2 *（宽+高）* 3.25;

            // calculare width times height

            glassArea =（宽* 3.25）*（高* 3.25）;



            //打印它
            Console.WriteLine（"木头的长度是"+ woodLength +"foot"）;

            Console.WriteLine（"玻璃的面积是"+ glassArea +"sqaure feet"）;



            Console.WriteLine（"你想要多少个窗口？"）;

            windowString = Console.ReadLine（）;

            int.Parse（windowString）;
$


            //计算（玻璃面积* windowAreaCharge）

            windowCost = glassArea * windowAreaCharge; 

           int windowCost;
            int windowCount;
            int totalCost;
           decimal windowAreaCharge;


            windowCost = 0;
            windowCount = 0;
            totalCost = 0;
            windowAreaCharge = 9.49m;


            double width;
            double height;
            double woodLength;
            double glassArea;
            string widthString;
            string heightString;
            string windowString;


            // read in the width
            Console.WriteLine("Plase enter the width in meters.");
            widthString = Console.ReadLine(); // get the value from the user
            width = double.Parse(widthString); //convert the string into a doubele

            // read in the height
            Console.WriteLine("Please enter the height in meters.");
            heightString = Console.ReadLine();
            height = double.Parse(heightString);

            // calculate (width.I + height) *2*3.25 and convert to feet
            woodLength = 2 * (width + height) * 3.25;
            //calculare width times height
            glassArea = (width * 3.25) * (height * 3.25);

            //print it
            Console.WriteLine("The length of the wood is " + woodLength + " feet ");
            Console.WriteLine("The area of the glass is " + glassArea + " sqaure feet ");

            Console.WriteLine("How many windows do you want?");
            windowString = Console.ReadLine();
            int.Parse(windowString);

            //calculate (area of glass * windowAreaCharge)
            windowCost = glassArea * windowAreaCharge; 

推荐答案

这是一个int。试试这个：

it's an int. Try this:

windowCost = (int)(glassArea * (double)windowAreaCharge);

问候，克里斯

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