using System;

public class Program {
  public static void Main(string[] args) {
    // Pattern 1: just two decimal places
    Console.WriteLine("**************************************");
    Console.WriteLine("Pattern 1: just two decimal places");
    Console.WriteLine("**************************************");
    Console.WriteLine(String.Format("{0:0.00}", 123.4567)); // "123.46"
    Console.WriteLine(String.Format("{0:0.00}", 123.4)); // "123.40"
    Console.WriteLine(String.Format("{0:0.00}", 123.0)); // "123.00"

    //Pattern 2: max. two decimal places
    Console.WriteLine("**************************************");
    Console.WriteLine("Pattern 2: max. two decimal places");
    Console.WriteLine("**************************************");
    Console.WriteLine(String.Format("{0:0.##}", 123.4567)); // "123.46"
    Console.WriteLine(String.Format("{0:0.##}", 123.4)); // "123.4"
    Console.WriteLine(String.Format("{0:0.##}", 123.0)); // "123"

    //Pattern 3: at least two digits before decimal point
    Console.WriteLine("***************************************************");
    Console.WriteLine("Pattern 3: at least two digits before decimal point");
    Console.WriteLine("***************************************************");
    Console.WriteLine(String.Format("{0:00.0}", 123.4567)); // "123.5"
    Console.WriteLine(String.Format("{0:00.0}", 23.4567)); // "23.5"
    Console.WriteLine(String.Format("{0:00.0}", 3.4567)); // "03.5"
    Console.WriteLine(String.Format("{0:00.0}", -3.4567)); // "-03.5"

    //Pattern 4: Thousand Separators
    Console.WriteLine("**************************************");
    Console.WriteLine("Pattern 4: Thousand Separators");
    Console.WriteLine("**************************************");
    Console.WriteLine(String.Format("{0:0,0.0}", 12345.67)); // "12,345.7"
    Console.WriteLine(String.Format("{0:0,0}", 12345.67)); // "12,346"

    //Pattern 5: Align Number with spaces
    Console.WriteLine("**************************************");
    Console.WriteLine("Pattern 5: Align Number with spaces");
    Console.WriteLine("**************************************");
    Console.WriteLine(String.Format("{0,10:0.0}", 123.4567)); // "     123.5"
    Console.WriteLine(String.Format("{0,-10:0.0}", 123.4567)); // "123.5     "
    Console.WriteLine(String.Format("{0,10:0.0}", -123.4567)); // "    -123.5"
    Console.WriteLine(String.Format("{0,-10:0.0}", -123.4567)); // "-123.5    "

    //Pattern 6: Numbers between zero and one
    Console.WriteLine("**************************************");
    Console.WriteLine("Pattern 6: Numbers between zero and one");
    Console.WriteLine("**************************************");
    Console.WriteLine(String.Format("{0:0.0}", 0.0)); // "0.0"
    Console.WriteLine(String.Format("{0:0.#}", 0.0)); // "0"
    Console.WriteLine(String.Format("{0:#.0}", 0.0)); // ".0"
    Console.WriteLine(String.Format("{0:#.#}", 0.0)); // ""     

    //Pattern 7: Custom formatting for negative numbers and zero
    Console.WriteLine("**********************************************************");
    Console.WriteLine("Pattern 7: Custom formatting for negative numbers and zero");
    Console.WriteLine("**********************************************************");
    Console.WriteLine(String.Format("{0:0.00;minus 0.00;zero}", 123.4567)); // "123.46"
    Console.WriteLine(String.Format("{0:0.00;minus 0.00;zero}", -123.4567)); // "minus 123.46"
    Console.WriteLine(String.Format("{0:0.00;minus 0.00;zero}", 0.0)); // "zero"
  }
}