<s>
Quantum	B-Device
Computation	I-Device
Language	I-Device
(	O
QCL	O
)	O
is	O
one	O
of	O
the	O
first	O
implemented	O
quantum	B-Device
programming	I-Device
languages	I-Device
.	O
</s>
<s>
Its	O
syntax	B-Application
resembles	O
the	O
syntax	B-Application
of	O
the	O
C	B-Language
programming	I-Language
language	I-Language
and	O
its	O
classical	O
data	O
types	O
are	O
similar	O
to	O
primitive	O
data	O
types	O
in	O
C	B-Language
.	O
One	O
can	O
combine	O
classical	O
code	O
and	O
quantum	O
code	O
in	O
the	O
same	O
program	O
.	O
</s>
<s>
Since	O
the	O
qcl	O
interpreter	O
uses	O
qlib	O
simulation	O
library	O
,	O
it	O
is	O
possible	O
to	O
observe	O
the	O
internal	O
state	O
of	O
the	O
quantum	O
machine	O
during	O
execution	O
of	O
the	O
quantum	B-Device
program	I-Device
.	O
</s>
<s>
defines	O
inverse	O
about	O
the	O
mean	O
operator	O
used	O
in	O
Grover	B-Algorithm
's	I-Algorithm
algorithm	I-Algorithm
(	O
it	O
is	O
sometimes	O
called	O
Grover	O
's	O
diffusion	O
operator	O
)	O
.	O
</s>
