Logical or: ||, or, OrElse

Logical OR works as follows: just in case it's the result false if both inputs are false, in all other cases the result is true. In next table you can find all possibilities:

a	b	x
False	False	False
False	True	True
True	False	True
True	True	True

information about the table: a, b are inputs, x is result

||

Description

par1 || par2

Used keywords: ||

Input

par1 - Logical value
par2 - Logical value

Output

Result - Logical value

If the first operand is true, then the second operand is not evaluated.

Compatible programing languages:
C | Visual C++ .NET | C++ | C# | Java | JavaScript | PHP

Examples

Example

In the source code you can find the equivalent of the above table, for easier orientation at the end of each line is a comment which shows the result.

a1 = false || false; // a1 = false
a2 = false || true;  // a2 = true
a3 = true  || false; // a3 = true
a4 = true  || true;  // a4 = true

Example

Even one example in what situations we can use the operation logical or:

(b || c) || a
a || true
a>1 || a<100

Example

Other pieces of example codes:

(10 >a || a<5)

a || true

j > 128 || false

or

Description

par1 or par2

Used keywords: or

Input

par1 - Logical value
par2 - Logical value

Output

Result - Logical value

If the first operand is true, then the second operand is not evaluated.

Compatible programing languages:
Pascal | Object Pascal | Free Pascal | PHP

Examples

Object Pascal

In the source code you can find the equivalent of the above table, for easier orientation at the end of each line is a comment which shows the result.

a1 := false or false; // a1 = false
a2 := false or true;  // a2 = true
a3 := true  or false; // a3 = true
a4 := true  or true;  // a4 = true

Object Pascal

Even one example in what situations we can use the operation logical or:

(b or c) or a
a or true
a>1 or a<100

Object Pascal

Other pieces of example codes:

j > 128 or false

a or true

(10 >a or a<5)

or

Description

par1 or par2

Used keywords: or

Input

par1 - Logical value
par2 - Logical value

Output

Result - Logical value

Both operands are evaluated independently of the value of the first operand.

Compatible programing languages:
Visual Basic .NET | FreeBASIC

Examples

Visual Basic .NET

In the source code you can find the equivalent of the above table, for easier orientation at the end of each line is a comment which shows the result.

a1 = false or false ' a1 = false
a2 = false or true  ' a2 = true
a3 = true  or false ' a3 = true
a4 = true  or true  ' a4 = true

Visual Basic .NET

Even one example in what situations we can use the operation logical or:

(b or c) or a
a or true
a>1 or a<100

Visual Basic .NET

Other pieces of example codes:

(10 >a or a<5)

a or true

j > 128 or false

OrElse

Description

par1 OrElse par2

Used keywords: orelse

Input

par1 - Logical value
par2 - Logical value

Output

Result - Logical value

If the first operand is true, then the second operand is not evaluated.

Compatible programing languages:
Visual Basic .NET | FreeBASIC

Examples

Visual Basic .NET

In the source code you can find the equivalent of the above table, for easier orientation at the end of each line is a comment which shows the result.

a1 = false OrElse false ' a1 = false
a2 = false OrElse true  ' a2 = true
a3 = true  OrElse false ' a3 = true
a4 = true  OrElse true  ' a4 = true

Visual Basic .NET

Even one example in what situations we can use the operation logical or:

(b OrElse c) OrElse a
a OrElse true
a>1 OrElse a<100

You can find it in the following collections: logical operators

Logical or in another programming language: