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

• Difficulty Level : Medium
• 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. Attention reader! All those who say programming isn't for kids, just haven't met the right mentors yet. Join the  Demo Class for First Step to Coding Coursespecifically designed for students of class 8 to 12.

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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.

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