double

System.Double
Double Precision Floating Point (-1.797 E 308 to 1.797 E 308)
17 significant digits.
The default value is 0.

double myDouble; 
System.Double myDouble; 

Explicit Data Type

You can append literal constants with the letter "D" or "d", although this is unnecessary because all floating-point numbers default to the double data type.

double myDouble = 1.6;                            'double is the default  
double myDouble = 1.6d;                           'Suffix is optional  
double myDouble = 1.6D;                           'Suffix is optional  

Converting

// Double To Integer 
double myDouble = 1.6; 
int myInteger = (int)myDouble; 

// Double To Decimal 
double myDouble = 1.6; 
int myDecimal = (decimal)myDouble; 

// Double To Float 
double myDouble = 1.6; 
float myFloat = (float)myDouble; 

Examples

double myDouble = 4/3;                            '=1.33333337  

double myDouble = 3.14E3;                         'Scientific notation   
System.Diagnostics.Debug.Print myDouble           '= 3140  

double myDouble = -1.0/0.0;                       'Negative infinity  
System.Diagnostics.Debug.Print myDouble           '= -Infinity