<s>
C++	O
does	O
n't	O
have	O
:	O
</s>
<s>
PROC	O
–	O
first	O
class	O
nested	O
functions	O
(	O
emulation	O
due	O
to	O
local	O
definitions	O
of	O
class-types	O
,	O
which	O
then	O
could	O
be	O
functors	B-Language
,	O
also	O
new	O
C++11	B-Language
has	O
lambda	O
functions	O
)	O
,	O
</s>
<s>
intuitive	O
declaration	O
syntax	O
due	O
to	O
its	O
origin	O
from	O
C	B-Language
.	O
</s>
<s>
overloaded	B-Language
procedures	I-Language
(	O
in	O
contrast	O
to	O
operators	O
)	O
,	O
</s>
<s>
textual	O
preprocessing	B-General_Concept
(	O
e.g.	O
</s>
<s>
Intent	O
ALGOL	O
68	O
C++Define	O
a	O
constant	O
int	O
x	O
=	O
888	O
;	O
Initialise	O
a	O
variable	O
int	O
x	O
:	O
=	O
888	O
;	O
Assign	O
a	O
value	O
888	O
to	O
a	O
variable	O
x	O
x	O
:	O
=	O
888	O
;	O
Compare	O
two	O
values	O
if	O
x	O
=	O
888	O
then	O
...	O
fi	O
Allocate	O
a	O
variable	O
from	O
the	O
heap	O
ref	O
int	O
x	O
=	O
heap	O
int	O
;	O
or	O
simply:heap	O
int	O
x	O
;	O
Compare	O
address	O
of	O
two	O
pointers	O
ref	O
int	O
x	O
,	O
y	O
;	O
if	O
x	O
:=	O
:	O
y	O
then	O
...	O
fi	O
Compare	O
value	O
referenced	O
by	O
two	O
pointers	O
ref	O
int	O
x	O
,	O
y	O
;	O
if	O
x	O
=	O
y	O
then	O
...	O
fi	O
Name	O
a	O
new	O
type	O
mode	O
longreal	O
=	O
long	O
real	O
;	O
or	O
(	O
as	O
of	O
C++11	B-Language
)	O
:Name	O
a	O
new	O
record	O
type	O
mode	O
cust	O
=	O
struct(string name, address )	O
;	O
Name	O
a	O
new	O
union	O
type	O
mode	O
taggedu	O
=	O
union(string s, real r )	O
;	O
Name	O
a	O
procedure	O
or	O
function	O
proc	O
f	O
=	O
(	O
real	O
x	O
)	O
real	O
:	O
(	O
code	O
;	O
result	O
)	O
;	O
Procedure	O
default	O
parameters	O
proc	O
p	O
=	O
(	O
union	O
(	O
real	O
,	O
void	O
)	O
in	O
x	O
)	O
void	O
:	O
</s>
<s>
(	O
real	O
x	O
=	O
(	O
in	O
x|( real	O
x	O
)	O
:x	O
|888	O
)	O
;	O
code	O
)	O
;	O
Name	O
a	O
new	O
operator	O
op	O
↑	O
=	O
(	O
real	O
x	O
,	O
y	O
)	O
real	O
:	O
x**y	O
;	O
Set	O
priority	O
on	O
a	O
new	O
operator	O
prio	O
↑	O
=	O
9	O
;	O
Chain	O
variables	O
assignment	O
a	O
:	O
=	O
b	O
:	O
=	O
c	B-Language
:	O
=d	O
;	O
Displacement	O
operator	O
-	O
ALGOL	B-General_Concept
68C	I-General_Concept
only	O
a	O
:	O
=	O
:=	O
b	O
:	O
=	O
:=	O
c	B-Language
:	O
=	O
:=d	O
;	O
Append	O
"	O
substr	O
"	O
to	O
a	O
variable	O
str	O
str	O
+	O
:=	O
"	O
substr	O
"	O
;	O
Prefix	O
"	O
substr	O
"	O
to	O
a	O
variable	O
str	O
"	O
substr	O
"	O
+	O
=	O
:	O
str	O
;	O
</s>
<s>
C/C	O
++	O
example	O
:	O
</s>
<s>
This	O
has	O
the	O
similar	O
effect	O
as	O
the	O
following	O
C++	O
code	O
:	O
</s>
