D Programming - Data Types

In the D programming language, data types refer to an extensive system used for declaring variables or functions of different types. The type of a variable determines how much space it occupies in storage and how the stored bit pattern is interpreted.

The types in D can be classified as follows −

The array types and structure types are referred to collectively as the aggregate types. The type of a function specifies the type of the function s return value. We will see basic types in the following section whereas other types will be covered in the upcoming chapters.

Integer Types

The following table gives psts standard integer types with their storage sizes and value ranges −

To get the exact size of a type or a variable, you can use the sizeof operator. The expression type.(sizeof) yields the storage size of the object or type in bytes. The following example gets the size of int type on any machine −

import std.stdio; 
 
int main() { 
   writeln("Length in bytes: ", ulong.sizeof); 

   return 0; 
}

Length in bytes: 8 

import std.stdio;

int main() { 
   writeln("Length in bytes: ", float.sizeof); 

   return 0; 
}

Length in bytes: 4

import std.stdio;

int main() {
   writeln("Length in bytes: ", char.sizeof);
   
   return 0;
}

Length in bytes: 1