Keywords are the words in a language that are used for some internal process or represent some predefined actions. It is a keyword that is used to declare a variable that can store a floating-point value from the range of ±5.0 x 10-324 to ±1.7 x 10308. It is an alias of System.Double. Basically, it is a 64-bit double precision floating point number and have 14 to 15 digit precision.
Double Keyword occupies 8 byte (64 bits) space in the memory.
double variable_name = value;
We can specify a suffix d or D to represent a double value. Also floating point value without using any suffix is considered as a double value.
Input: num: 1234.5678 Output: num: 1234.5678 Size of a double variable: 8 Input: num = -67895.4322D Output: Type of num: System.Double num: -67895.4322 Size of a double variable: 8
num: 1234.5678 Size of a double variable: 8
Type of num: System.Double num: -67895.4322 Size of a double variable: 8 Min value of double: -1.79769313486232E+308 Max value of double: 1.79769313486232E+308