Operators

Question 1

Operators

Answer 1

• Operators are tokens that carry out specific
operations on data.
• The data could be a variable or a constant or
a literal or an expression and it is known as
an Operand.

Question 2

Classification of operators based on number of operands

Answer 2

• Unary - act on one operands
• Binary - act on two operands
• Ternary - act on three operands

Question 3

Classification of operators based on operations

Answer 3

• Based on the type of operations they
perform, they are classified as[CARLA]:
- Conditional operators
- Arithmetic operators
- Relational operators
- Logical operators
- Assignment operators
– Shift operators (not included in syllabus)
– Bit-wise operators (not included in syllabus)

Question 4

Precedence of operators

Answer 4

• This determines the order in which the
expressions are evaluated. Java uses BODMAS
and Associativity rules to evaluate an expression.
The order of evaluation is as follows:
1. Expression with Parenthesis
2. Prefix Operators (Increment ++, Decrement –)
3. Arithmetic operators
4. Relational operators
5. Logical Operators
6. Assignment Operators

Question 5

Operator Associativity

Answer 5

• When more than one operation in an expression has the same precedence, then the associativity rules determine the order of the operations. Associativity rules determine the grouping of operands and operators in an expression.

Question 6

Modulus operator

Answer 6

It is used for finding the remainder in a division operation

Question 7

Plus operator

Answer 7

• Adding literals, variables, constants or expressions of numeric data types
• Concatenating strings

Question 8

Unary minus

Answer 8

It negates an arithmetic operand’s value.

Question 9

Division operator

Answer 9

• Returns the quotient created by the integer division of a whole number when it’s operands are of integral data types.
• Returns the quotient created by the division of its operands when one of its operands are of fractional data types.

Question 10

Relational operators

Answer 10

Relational operators are used for comparing two different operands. The operands can be variables, literals or arithmetic expressions. If the comparison is true, it results into the boolean value true and if the comparison is false it results into the Boolean value false.

They do not work with Strings.

Question 11

Logical operators

Answer 11

These operators are used for forming more complex
expressions. They are used for combining two relational
expressions.

Question 12

Equals operator

Answer 12

• = is used for assigning a literal or a variable or the result of an expression to a variable on the left hand side.

Question 13

Presedence of logical operators

Answer 13

! -> && -> ||