>I cant find it on my keyboard.
Oh dear. It's the vertical bar, placed as the shift value for my backslash key, but it could be somewhere else (or not present at all) depending on the keyboard. Note that the || operator is two vertical bars, not a single key on your keyboard. If you still can't find it, you may fall into the category of C programmers that need to take advantage of C's trigraph sequences:
int main ( void )
if ( 0 ??!??! 1 )
puts ( "True" );
puts ( "False" );
This does the same thing as my first example, except the ??! trigraph represents the vertical bar with a combination of universal characters. Here are all of the trigraphs if you discover you're missing other keys: