<s>
The	O
arithmetic	B-Language
IF	I-Language
statement	O
is	O
a	O
three-way	O
arithmetic	O
conditional	B-Language
statement	I-Language
,	O
first	O
seen	O
in	O
the	O
first	O
release	O
of	O
Fortran	B-Application
in	O
1957	O
,	O
and	O
found	O
in	O
all	O
later	O
versions	O
,	O
and	O
some	O
other	O
programming	O
languages	O
,	O
such	O
as	O
FOCAL	B-Language
.	O
</s>
<s>
Unlike	O
the	O
logical	B-Language
IF	I-Language
statements	I-Language
seen	O
in	O
other	O
languages	O
,	O
the	O
Fortran	B-Application
statement	O
defines	O
three	O
different	O
branches	O
depending	O
on	O
whether	O
the	O
result	O
of	O
an	O
expression	O
is	O
negative	O
,	O
zero	O
,	O
or	O
positive	O
,	O
in	O
said	O
order	O
,	O
written	O
as	O
:	O
</s>
<s>
While	O
it	O
originally	O
was	O
the	O
only	O
kind	O
of	O
IF	O
statement	O
provided	O
in	O
Fortran	B-Application
,	O
the	O
feature	O
has	O
been	O
used	O
less	O
and	O
less	O
frequently	O
after	O
the	O
logical	B-Language
IF	I-Language
statements	I-Language
were	O
introduced	O
,	O
and	O
was	O
finally	O
labeled	O
obsolescent	O
in	O
Fortran	B-Application
90	O
.	O
</s>
<s>
As	O
of	O
Fortran	B-Application
2018	O
,	O
it	O
is	O
no	O
longer	O
required	O
for	O
compilers	O
to	O
implement	O
arithmetic	B-Language
IF	I-Language
and	O
it	O
is	O
considered	O
to	O
be	O
a	O
deleted	O
feature	O
.	O
</s>
<s>
The	O
GNU	O
Fortran	B-Application
compiler	O
has	O
been	O
producing	O
warnings	O
for	O
arithmetic	B-Language
IF	I-Language
by	O
default	O
since	O
its	O
9.1	O
release	O
in	O
2019	O
.	O
</s>
