Module 2 Flashcards
Is an attribute associated with a piece of data that tells a computer system how to interpret its value.
Data Type
Specifies the size and
type of variable values, and it has no additional methods.
Primitive data types
Are called reference types because they refer to objects.
Non-primitive data types
Can store whole numbers from -128 to 127.
Byte
Can store whole numbers from -32768 to 32767
Short
Can store whole numbers from
-2147483648 to 2147483647.
Int
Can store whole numbers from -
9223372036854775808 to 9223372036854775807.
Long
Can store fractional numbers from 3.4e−038 to 3.4e+038. Note that you should end the value with an
“f”:
Float
Can store fractional numbers from
1.7e−308 to 1.7e+308.
Double
Can only take the values true or false:
Booleans
Used to store a single character. The character must be surrounded by single quotes, like ‘A’ or ‘c’:
Characters
Is used to store a sequence of
characters (text).
String
Any constant value which can be assigned to the variable
Literal/Constant
Used to represent a decimal, binary, or hexadecimal value.
Integer Literals
Composed of a sequence of decimal digits followed by either a decimal fraction, a decimal
exponent, or both.
Floating-point Literals
Have only two values, true or false.
Boolean literals
Represented as a single character
surrounded by single quotes.
Character Literals
Represent multiple characters and are enclosed
by double quotes.
String Literals
A name which is associated with a value that can be changed.
Variables
Constitute the basic building block to any programming language.
Operators
Are used in mathematical expressions in the same way that they are used in algebra.
Arithmetic Operators
Also known as Comparison Operators are used to check for relations like equality, greater than, less than. They return Boolean result after the comparison.
Relational
Operators
Also known as Logical Operators are used to perform logical “AND”, “OR” and “NOT” operation, i.e. the function similar to AND gate and OR gate in digital electronics.
Boolean Operators
Used to assign values to a variable. The left side operand is a variable and the right side operand of the assignment operator is a value.
Assignment Operators
