<s>
In	O
computer	B-General_Concept
programming	I-General_Concept
,	O
a	O
logic	O
error	O
is	O
a	O
bug	B-Error_Name
in	O
a	O
program	O
that	O
causes	O
it	O
to	O
operate	O
incorrectly	O
,	O
but	O
not	O
to	O
terminate	O
abnormally	O
(	O
or	O
crash	B-General_Concept
)	O
.	O
</s>
<s>
Logic	O
errors	O
occur	O
in	O
both	O
compiled	B-Language
and	O
interpreted	B-Application
languages	I-Application
.	O
</s>
<s>
Unlike	O
a	O
program	O
with	O
a	O
syntax	B-Application
error	I-Application
,	O
a	O
program	O
with	O
a	O
logic	O
error	O
is	O
a	O
valid	O
program	O
in	O
the	O
language	O
,	O
though	O
it	O
does	O
not	O
behave	O
as	O
intended	O
.	O
</s>
<s>
This	O
example	O
function	O
in	O
C	B-Language
to	O
calculate	O
the	O
average	O
of	O
two	O
numbers	O
contains	O
a	O
logic	O
error	O
.	O
</s>
<s>
It	O
is	O
missing	O
parentheses	O
in	O
the	O
calculation	O
,	O
so	O
it	O
compiles	B-Language
and	O
runs	O
but	O
does	O
not	O
give	O
the	O
expected	O
answer	O
due	O
to	O
operator	O
precedence	O
(	O
division	O
is	O
evaluated	O
before	O
addition	O
)	O
.	O
</s>
