Answer:
The DoubleDecimalTest class is as follows:
using System;
class DoubleDecimalTest {
  static void Main() {
      double doubleNum = 173737388856632566321737373676D;  
     decimal decimalNum = 173737388856632566321737373676M;
    Console.WriteLine(doubleNum);
    Console.WriteLine(decimalNum);  }
}
Explanation:
Required
Program to test double and decimal variables in C#
This declares and initializes double variable doubleNum
      double doubleNum = 173737388856632566321737373676D;
This declares and initializes double variable decimalNum (using the same value as doubleNum)
      decimal decimalNum = 173737388856632566321737373676M;
This prints doubleNum
    Console.WriteLine(doubleNum);
This prints decimalNum
    Console.WriteLine(decimalNum);
<em>Unless the decimal variable is commented out or the value is reduced to a reasonable range, the program will not compile without error.</em>