C# Console.WriteLine方法代码示例

// This code example demonstrates the Console.WriteLine() method.
// Formatting for this example uses the "en-US" culture.

using System;
class Sample 
{
    enum Color {Yellow = 1, Blue, Green};
    static DateTime thisDate = DateTime.Now;

    public static void Main() 
    {
        Console.Clear();

        // Format a negative integer or floating-point number in various ways.
        Console.WriteLine("Standard Numeric Format Specifiers");
        Console.WriteLine(
            "(C) Currency: . . . . . . . . {0:C}\n" +
            "(D) Decimal:. . . . . . . . . {0:D}\n" +
            "(E) Scientific: . . . . . . . {1:E}\n" +
            "(F) Fixed point:. . . . . . . {1:F}\n" +
            "(G) General:. . . . . . . . . {0:G}\n" +
            "    (default):. . . . . . . . {0} (default = 'G')\n" +
            "(N) Number: . . . . . . . . . {0:N}\n" +
            "(P) Percent:. . . . . . . . . {1:P}\n" +
            "(R) Round-trip: . . . . . . . {1:R}\n" +
            "(X) Hexadecimal:. . . . . . . {0:X}\n",
            -123, -123.45f); 

        // Format the current date in various ways.
        Console.WriteLine("Standard DateTime Format Specifiers");
        Console.WriteLine(
            "(d) Short date: . . . . . . . {0:d}\n" +
            "(D) Long date:. . . . . . . . {0:D}\n" +
            "(t) Short time: . . . . . . . {0:t}\n" +
            "(T) Long time:. . . . . . . . {0:T}\n" +
            "(f) Full date/short time: . . {0:f}\n" +
            "(F) Full date/long time:. . . {0:F}\n" +
            "(g) General date/short time:. {0:g}\n" +
            "(G) General date/long time: . {0:G}\n" +
            "    (default):. . . . . . . . {0} (default = 'G')\n" +
            "(M) Month:. . . . . . . . . . {0:M}\n" +
            "(R) RFC1123:. . . . . . . . . {0:R}\n" +
            "(s) Sortable: . . . . . . . . {0:s}\n" +
            "(u) Universal sortable: . . . {0:u} (invariant)\n" +
            "(U) Universal full date/time: {0:U}\n" +
            "(Y) Year: . . . . . . . . . . {0:Y}\n", 
            thisDate);

        // Format a Color enumeration value in various ways.
        Console.WriteLine("Standard Enumeration Format Specifiers");
        Console.WriteLine(
            "(G) General:. . . . . . . . . {0:G}\n" +
            "    (default):. . . . . . . . {0} (default = 'G')\n" +
            "(F) Flags:. . . . . . . . . . {0:F} (flags or integer)\n" +
            "(D) Decimal number: . . . . . {0:D}\n" +
            "(X) Hexadecimal:. . . . . . . {0:X}\n", 
            Color.Green);       
    }
}

//引入命名空间
using System;

public class TipCalculator
{
    private const double tipRate = 0.18;
    public static void Main(string[] args)
    {
        double billTotal;
        if (args.Length == 0 || ! Double.TryParse(args[0], out billTotal))
        {
            Console.WriteLine("usage: TIPCALC total");
            return;
        }
        double tip = billTotal * tipRate;
        Console.WriteLine();
        Console.WriteLine($"Bill total:\t{billTotal,8:c}");
        Console.WriteLine($"Tip total/rate:\t{tip,8:c} ({tipRate:p1})");
        Console.WriteLine(("").PadRight(24, '-'));
        Console.WriteLine($"Grand total:\t{billTotal + tip,8:c}");
    }
}

/*
>tipcalc 52.23

Bill total:       $52.23
Tip total/rate:    $9.40 (18.0 %)
------------------------
Grand total:      $61.63
*/

string[] lines = { "This is the first line.", 
                   "This is the second line." };
// Output the lines using the default newline sequence.
Console.WriteLine("With the default new line characters:");
Console.WriteLine();
foreach (string line in lines)
   Console.WriteLine(line);

Console.WriteLine();

// Redefine the newline characters to double space.
Console.Out.NewLine = "\r\n\r\n";
// Output the lines using the new newline sequence.
Console.WriteLine("With redefined new line characters:");
Console.WriteLine();
foreach (string line in lines)
   Console.WriteLine(line);

Random rnd = new Random();
// Generate five random Boolean values.
for (int ctr = 1; ctr <= 5; ctr++) {
   Boolean bln = Convert.ToBoolean(rnd.Next(0, 2));
   Console.WriteLine("True or False: {0}", bln);
}

// The example displays an output similar to the following:
//       True or False: False
//       True or False: True
//       True or False: False
//       True or False: False
//       True or False: True

//引入命名空间
using System;

public class Example
{
   public static void Main()
   {
      Console.WriteLine("Today's date: {0:D}", DateTime.Now);
   }
}

// Assign 10 random integers to an array.
Random rnd = new Random();
int[] numbers = new int[10]; 
for (int ctr = 0; ctr <= numbers.GetUpperBound(0); ctr++)
   numbers[ctr] = rnd.Next();

// Determine whether the numbers are even or odd.
foreach (var number in numbers) {
   bool even = (number % 2 == 0);
   Console.WriteLine("Is {0} even:", number);
   Console.WriteLine(even);
   Console.WriteLine();      
}

Object[] values = { true, 12.632, 17908, "stringValue",
                           'a', 16907.32m };
foreach (var value in values)
   Console.WriteLine(value);

//引入命名空间
using System;

class MainClass
{
   static void Main()
   {
      Console.WriteLine(" {0} and {1}.", 3, 6);
   }
}