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EXPRESSIONS

An expression has two parts: Operand and Operator. The variables or values that are used in the
expression are called Operand and the symbols on which the operand works such as + (addition), –
(subtraction), etc. are known as Operators. For example:

c = a + b;

Here, a and b are operands and + is the operator.

Operators

Java usually has a group of built-in operators with common meaning assigned to them, though in some
special cases it allows programmers to assign different meanings. Let us understand with an example:

double m=34.76, n= 3.6, r;

int a = 1, b = 4, c;

r = m * n;
c = b - a;

System.out.println(“The product is:” +r);

System.out.println(“The difference is:” +c);

Explanation of code: In each line, we are using different types of operators and related operands.

In the 1st line:
“=” acts as an assignment operator and “m”, “n”, 34.76 and 3.6 are variables and constants.

Similarly in the 2nd line:

“=” acts as an assignment operator and “a”, “b”, 1 and 4 are variables and constants.
In the 3rd line:

“=” and “*” acts as an assignment operator and binary operator respectively and “m”, “n” and “r”
are operands.

In the 4th line:

“=” and “-” acts as an assignment operator and binary operator respectively and “a”, “b” and “c” are
operands.
In the above example, m*n and b-a are Arithmetic Expression and r = m*n and c = b-a is said to be
Arithmetic Statement.

Arithmetic Expression: Any meaningful expression containing identifiers, literals and arithmetical
operators and producing a result is called an Arithmetic Expression.

Example: a*b, 2*(l + b)

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