C - Logical or: ||

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.

Examples

C

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 = 0 || 0; // a1 = false
a2 = 0 || 1;  // a2 = true
a3 = 1  || 0; // a3 = true
a4 = 1  || 1;  // a4 = true

C

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

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

C

Other pieces of example codes:

a || 1

(10 >a || a<5)

j > 128 || 0

You can find it in the following collections: logical operators

Logical or in another programming language:

Differences to: