<s>
Qalculate	B-Language
!	I-Language
</s>
<s>
is	O
an	O
arbitrary	B-Algorithm
precision	I-Algorithm
cross-platform	O
software	O
calculator	B-Application
.	O
</s>
<s>
It	O
supports	O
complex	O
mathematical	O
operations	O
and	O
concepts	O
such	O
as	O
derivation	B-Algorithm
,	O
integration	O
,	O
data	O
plotting	O
,	O
and	O
unit	O
conversion	O
.	O
</s>
<s>
Qalculate	B-Language
!	I-Language
</s>
<s>
supports	O
common	O
mathematical	O
functions	O
and	O
operations	O
,	O
multiple	O
bases	O
,	O
autocompletion	O
,	O
complex	O
numbers	O
,	O
infinite	O
numbers	O
,	O
arrays	B-Data_Structure
and	O
matrices	B-Architecture
,	O
variables	O
,	O
mathematical	O
and	O
physical	O
constants	O
,	O
user-defined	O
functions	O
,	O
symbolic	O
derivation	B-Algorithm
and	O
integration	O
,	O
solving	O
of	O
equations	O
involving	O
unknowns	O
,	O
uncertainty	O
propagation	O
using	O
interval	B-Algorithm
arithmetic	I-Algorithm
,	O
plotting	O
using	O
Gnuplot	B-Application
,	O
unit	O
and	O
currency	O
conversion	O
and	O
dimensional	O
analysis	O
,	O
and	O
provides	O
a	O
periodic	O
table	O
of	O
elements	O
,	O
as	O
well	O
as	O
several	O
functions	O
for	O
computer	O
science	O
,	O
such	O
as	O
character	O
encoding	O
and	O
bitwise	O
operations	O
.	O
</s>
<s>
It	O
provides	O
four	O
interfaces	O
:	O
Two	O
GUIs	B-Application
,	O
one	O
using	O
GTK	B-Application
(	O
qalculate-gtk	O
)	O
and	O
another	O
using	O
Qt	B-Language
(	O
qalculate-qt	O
)	O
,	O
a	O
library	B-Library
for	O
use	O
in	O
other	O
programs	O
(	O
libqalculate	O
)	O
,	O
and	O
a	O
CLI	B-Application
program	O
for	O
use	O
in	O
a	O
terminal	B-General_Concept
(	O
qalc	O
)	O
.	O
</s>
<s>
Qalculate	B-Language
!	I-Language
</s>
<s>
Qalculate	B-Language
!	I-Language
</s>
<s>
Qalculate	B-Language
!	I-Language
</s>
<s>
Qalculate	B-Language
!	I-Language
</s>
<s>
"	O
In	O
our	O
example	O
of	O
Figure	O
7	O
,	O
we	O
choose	O
to	O
execute	O
/usr/bin/qalculate	O
-gtk	O
,	O
a	O
calculator	B-Application
.	O
</s>
<s>
Since	O
the	O
stack	O
of	O
the	O
DOSBox	B-Application
process	O
is	O
non-executable	O
,	O
we	O
cannot	O
directly	O
inject	O
our	O
shellcode	O
on	O
it.	O
"	O
</s>
<s>
"	O
The	O
Gnome	B-Language
calculator	I-Language
was	O
used	O
to	O
perform	O
these	O
calculations	O
and	O
the	O
results	O
were	O
verified	O
using	O
the	O
Qalculate	B-Language
!	I-Language
</s>
<s>
calculator	B-Application
and	O
WolframAlpha	B-Application
(	O
15	O
)	O
since	O
spreadsheets	B-Application
are	O
unable	O
to	O
perform	O
these	O
calculations.	O
"	O
</s>
