Question

how to write or in c?

Answer 1

Is "||" (without the quotes) what you're looking for?

Answer 2

Its "||", like the above guy said.

Answer 3

Technically, there's two forms of or. For bitwise or operations:

char foo = 'A' | 0x20;

one pipe symbol is used '|'.

In comparison statements:

if( this || that )
/* do something */

a double pipe symbol "||" is used.