Extended Logic Function: IFOIF 
Logic.xla calculates an "if and only if" function, P Û Q

In logic, P Û Q when P and Q have the same truth values.

Syntax: "=IFOIF(argument1,argument2)",
where argument1 and argument2 have a value of true or false.

Note: A value of 1 may be substituted for "TRUE" 
and 0 may be substituted for "FALSE".  In the table below,
values below P Û Q and P Û R were generated using the IFOIF function.

P

Q

R

P Û Q

P Û R

TRUE

TRUE

1

TRUE

TRUE

FALSE

TRUE

1

FALSE

FALSE

TRUE

FALSE

0

FALSE

FALSE

FALSE

FALSE

0

TRUE

TRUE

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