如何使用嵌套 For 循环显示数组值？

Question

在我们开始之前，我是编程和 C# 语言的新手，所以请耐心等待。 我遇到的问题是像这样在彼此面前显示两个单独的数组值：

整数类型：sbyte、byte、short、ushort
Real 浮点类型：float、double

我试过的代码是：

string[] VariableTypes = { "Integer Type", "Real Floating Point Types" };

string[] IntergerTypes = { "sbyte", "byte", "short", "ushort" };

for (int i = 0; i <= VariableTypes.Length - 1; i++)
{
    for(int j=0; j<=IntergerTypes.Length - 1; j++)
    {
        Console.Write(IntergerTypes[j] + " ");
    }
    Console.WriteLine(VariableTypes[i] + " : ");
}

我得到的输出：

sbyte byte short ushort 整数类型：
sbyte byte short ushort 实数浮点类型：

Answer 1

您需要另一个数组来保存要与Real Floating Point Types相关的值，然后有条件地检查变量类型以查看与之关联的整数类型。

string[] VariableTypes = { "Integer Type", "Real Floating Point Types" };
string[] FloatingPointTypes = { "float", "double" };
string[] IntergerTypes = { "sbyte", "byte", "short", "ushort" };

for (int i = 0; i <= VariableTypes.Length - 1; i++)
{
    Console.WriteLine(VariableTypes[i] + " : ");

    if(VariableTypes[i] == "Integer Type")
    {
        for(int j=0; j<=IntergerTypes.Length - 1; j++)
        {
            Console.Write(IntergerTypes[j] + ", ");
        }
    }
    else
    {
        for(int j=0; j<=FloatingPointTypes.Length - 1; j++)
        {
            Console.Write(FloatingPointTypes[j] + ", ");
        }
    }
}

在我看来，如果您只想要一种实现上述输出的方法，那么在没有嵌套循环的情况下这样做会更干净：

string[] FloatingPointTypes = { "float", "double" };
string[] IntergerTypes = { "sbyte", "byte", "short", "ushort" };

Console.WriteLine("Integer Type: " + string.Join(", ", IntergerTypes));
Console.WriteLine("Real Floating Point Types: " + string.Join(", ", FloatingPointTypes));

另外，您可以利用一个类使您的工作更简化。 请参阅以下内容：

public class VariableType
{
    public string Name { get; set; }

    public List<string> DataTypes { get; set; }
}

并通过以下步骤使用该类来实现所需的结果：

var variableTypes = new List<VariableType>
{
    new VariableType
    {
        Name = "Integer Types",
        DataTypes = new List<string>{ "sbyte", "byte", "short", "ushort" }
    },
    new VariableType
    {
        Name = "Real Floating Point Types",
        DataTypes = new List<string>{ "float", "double" }
    }
};

foreach(var variableType in variableTypes)
{
    Console.WriteLine(variableType.Name + " : " + string.Join(", ", variableType.DataTypes));
}

Answer 2

string[] VariableTypes = {
  "Integer Type", "Real Floating Point Types" 
};
string[][] NumberTypes = {
  new string[] { "sbyte", "byte", "short", "ushort" },
  new string[] { "float", "double" }
};

for (int i = 0; i < VariableTypes.Length; i++)
{
    Console.Write(VariableTypes[i] + " : ");
    for(int j = 0; j < NumberTypes[i].Length; j++)
    {
        Console.Write(NumberTypes[i][j] + " ");
    }
    Console.WriteLine();
}

Answer 3

这是实现此目的的简短方法：

string[] VariableTypes = { "Integer Types", "Real Floating Point Types" };
string[] IntegerTypes = { "sbyte", "byte", "short", "ushort" };
string[] RealFloatingPointTypes = { "float", "double" };
Console.WriteLine(String.Concat(VariableTypes[0], " : ", String.Join(", ", IntegerTypes)));
Console.WriteLine(String.Concat(VariableTypes[1], " : ", String.Join(", ", RealFloatingPointTypes)));