Primitive Data types

In computer science, primitive data type is either of the following:

• a basic type is a data type provided by a programming language as a basic building block. Most languages allow more complicated composite types to be recursively constructed starting from basic types.
• a built-in type is a data type for which the programming language provides built-in support.

primitive  Data types include:

• Character (character, char);
• Integer (integer, int, short, long, byte) with a variety of precisions;
• Floating-point number (float, double, real, double precision);
• Fixed-point number (fixed) with a variety of precisions and a programmer-selected scale.
• Boolean, logical values true and false.
• Reference (also called a pointer or handle), a small value referring to another object's address in memory, possibly a much larger one.

Integer numbers

An integer data type can hold a whole number, but no fraction. Integers may be either signed (allowing negative values) or unsigned (nonnegative values only). Typical sizes of integers are:

Size	Names	Signed Range	Unsigned Range
8 bits	Byte	−128 to +127	0 to 255
16 bits	Word, short int	−32,768 to +32,767	0 to 65,535
32 bits	Double Word, long int (win32, win64, 32-bit Linux[1])	−2,147,483,648 to +2,147,483,647	0 to 4,294,967,295
64 bits	long int (C in 64-bit linux[1]), long long (C), long (Java, the signed integer variant only[2]))	−9,223,372,036,854,775,808 to +9,223,372,036,854,775,807	0 to 18,446,744,073,709,551,615
unlimited	Bignum

Booleans

boolean values may be implicitly converted to integers, according to the mapping false → 0 and true → 1 (for example, true + true would be a valid expression evaluating to 2). The boolean type bool in C++ is considered an integral type and is a cross between numeric type and a logical type.