Infix, Postfix and Prefix Expressions/Notations

What is an Expression and What are the types of Expressions?

Last Updated : 02 Aug, 2019

Expression: An expression is a combination of operators, constants and variables. An expression may consist of one or more operands, and zero or more operators to produce a value.

Example:

a+b
c
s-1/7*f
.
.
etc

Types of Expressions: Expressions may be of the following types:

Constant expressions: Constant Expressions consists of only constant values. A constant value is one that doesn't change. Examples:
```
5, 10 + 5 / 6.0, 'x’
```
Integral expressions: Integral Expressions are those which produce integer results after implementing all the automatic and explicit type conversions. Examples:
```
x, x * y, x + int( 5.0)
```
where x and y are integer variables.
Floating expressions: Float Expressions are which produce floating point results after implementing all the automatic and explicit type conversions. Examples:
```
x + y, 10.75
```
where x and y are floating point variables.
Relational expressions: Relational Expressions yield results of type bool which takes a value true or false. When arithmetic expressions are used on either side of a relational operator, they will be evaluated first and then the results compared. Relational expressions are also known as Boolean expressions. Examples:
```
x <= y, x + y > 2
```
Logical expressions: Logical Expressions combine two or more relational expressions and produces bool type results. Examples:
```
 x > y && x == 10, x == 10 || y == 5 
```
Pointer expressions: Pointer Expressions produce address values. Examples:
```
&x, ptr, ptr++
```
where x is a variable and ptr is a pointer.
Bitwise expressions: Bitwise Expressions are used to manipulate data at bit level. They are basically used for testing or shifting bits. Examples:
```
x << 3
```
shifts three bit position to left
```
y >> 1
```
shifts one bit position to right. Shift operators are often used for multiplication and division by powers of two.

Note: An expression may also use combinations of the above expressions. Such expressions are known as compound expressions.

Infix, Postfix and Prefix Expressions/Notations

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