Question

我正在学习C＃，我想用C＃做简单的数学问题来提高我的技能。有人能告诉我这段代码中缺少什么吗？我希望用户输入特定的长度，宽度和高度，然后代码将乘以它然后除以1728然后显示但它不能正常工作。有人可以帮助我，谢谢你

        Console.Write("Enter your Length: ");
        int length = new int();
        Console.ReadLine();

        Console.Write("Enter your Width: ");
        int width = new int();
        Console.ReadLine();

        Console.Write("Enter your Height: ");
        int height = new int();
        Console.ReadLine();

        int totalDims = new int();
        totalDims = length * width * height;
        int cubicFeet = new int();
        cubicFeet = totalDims/1728;

        Console.WriteLine("Your total cubic feet is " + cubicFeet);
        Console.ReadLine();

Answer 1

您必须解析从控制台读取的行int：

int length = 0;
int.TryParse(Console.ReadLine(), out length);
...
int width = 0;
int.TryParse(Console.ReadLine(), out width);
...
int height = 0;
int.TryParse(Console.ReadLine(), out height);

另外，如果您希望cubicFeet为浮动数字：

double cubicFeet = totalDims / 1728.0;

Answer 2

您目前从未在Console.ReadLine()来电中设置从命令行中读取的值。

Console.ReadLine()实际上会返回一个表示输入值的字符串，因此您需要将其转换为正确的数字类型，以便您可以使用它。

由于您正在处理整数，因此可以使用Convert.ToInt32()或Int32.Parse()方法，如下所示：

Console.Write("Enter your Length: ");
// Read and parse your length
int length = Convert.ToInt32(Console.ReadLine());

Console.Write("Enter your Width: ");
// Read and parse your width
int width = Convert.ToInt32(Console.ReadLine());

Console.Write("Enter your Height: ");
// Read and parse your height
int height = Convert.ToInt32(Console.ReadLine());

// Now you have all of your dimensions so calculate
int totalDims = length * width * height;
// Since you are performing division, you could have a fractional
// value here, so you might want to use another type like decimal
decimal cubicFeet = totalDims / 1728m;

// Output your result
Console.WriteLine("Your total cubic feet is " + cubicFeet);

如果您想要实现更安全的解决方案，您应该考虑使用Int32.TryParse()方法，它会让您知道转换是否良好，并允许您再次提示：

int length, width, height, totalDims;

Console.Write("Enter your Length: ");
// Read and parse your length
while(!Int32.TryParse(Console.ReadLine(), out length)){
    Console.Write("Enter your Length again: ");
}

Console.Write("Enter your Width: ");
// Read and parse your width
while(!Int32.TryParse(Console.ReadLine(), out width)){
    Console.Write("Enter your Width again: ");
}

Console.Write("Enter your Height: ");
// Read and parse your height
while(!Int32.TryParse(Console.ReadLine(), out height)){
    Console.Write("Enter your Height again: ");
}

// Now you have all of your dimensions so calculate
totalDims = length * width * height;
// Since you are performing division, you could have a fractional
// value here, so you might want to use another type like decimal
decimal cubicFeet = totalDims / 1728m;
// Output your result
Console.WriteLine("Your total cubic feet is " + cubicFeet);

你可以see a complete working example of this in action here。

Answer 3

1。）你必须设置你的号码。 Console.ReadLine（）返回您在控制台中输入的输入的字符串值，因此您必须将其转换为int。

2。）最后的操作可能会返回一个小数，所以totalDims和cubicFeet是十进制。

        Console.Write("Enter your Length: ");
        int length = new int();
        length = int.Parse(Console.ReadLine());

        Console.Write("Enter your Width: ");
        int width = new int();
        width = int.Parse(Console.ReadLine());

        Console.Write("Enter your Height: ");
        int height = new int();
        height = int.Parse(Console.ReadLine());

        int totalDims = new int();
        totalDims = length * width * height;

        //isnt cubic feet just length * width * height?
        //decimal cubicFeet = new decimal();
        //cubicFeet = totalDims;

        Console.WriteLine("Your total cubic feet is " + totalDims);
        Console.ReadLine();

使用C＃的基本数学问题

3 个答案: