C
3:
.
1.
1.
2.
2.
1.
2. C:
3. C:
4. C: ! – "
#
5. C: $
%#
6. C:
%#
7. C: & !
3. "
1.
2. C:
3. C:
4. C: ! – "
5. C: ! – #
6. C: $
%#
7. C:
%#
8. C: & !
.
A.
1.
1.
« » ! :
• ! (enqueue) , "
• ! (dequeue) ,
enqueue(2)
2
:
• ! " # ! $ !
% & :
• ' ! # ! ! ! # ! (First In – First
Out: FIFO)
enqueue(4)
2 4
4
dequeue( )
enqueue(5)
4
enqueue(3)
4 5
5
3
A.
1.
2. (
' :
• (init)
• $ (enqueue)
• ! (dequeue)
• ! (empty)
• ! (full)
)! " ! :
• ! ( )
• *!" ( ! )
• + "
• !" " ( ! )

A.
2. *!"
1. ,
% ! # " ! ( ) ! :
• - ! N !
• ." (finish) ! "
• (, 0)
/"# C
a[0]
…
a[1] a[2] a[2] a[N-1]
finish=2
4 5 34 5 3
A.
2. *!"
2. )" ! C: "#
& C " :
• (struct) :
• - QUEUE_SIZE
• ." (finish) ! " :
• *! 0…QUEUE_SIZE-1 "
• -1 .
#define QUEUE_SIZE 10 /* Megethos pinaka ouras */
typedef int elem; /* typos dedomenwn ouras */
struct queue{
elem array[QUEUE_SIZE]; /* pinakas stoixeiwn */
int finish; /* telos tis ouras */
};
typedef struct queue QUEUE; /* Sinwnimo tis ouras */
…
finish=2
2 6 4
* ! :
0 1 2 3 QUEUE_SIZE-1
array
A.
2. *!"
3. )" ! C: * !
! " -1
/* QU_init(): arxikopoiei tin oura */
void QU_init(QUEUE *q)
{
q->finish=-1;
}
…
finish=??
0&1:
0 1 2 3 QUEUE_SIZE-1
array
…
finish=-1
0 1 2 3 QUEUE_SIZE-1
array
,'*:
:
• ! ! ! " 2
!
A.
2. *!"
4. )" ! C: -" – + /
!
! ( ! # ), ." ! ." finish
-1 ( N-1)
/* QU_empty(): epistrefei TRUE/FALSE
* analoga me to an i oura einai adeia */
int QU_empty(QUEUE q)
{
return q.finish==-1;
}
/* QU_full(): epistrefei TRUE/FALSE
* analoga me to an i oura einai gemati */
int QU_full(QUEUE q)
{
return q.finish==QUEUE_SIZE-1;
}

5
A.
2. *!"
5. )" ! C: %
"
$ ! # finish+1 ( 2
)
/* QU_enqueue(): Eisagei to x stin oura q
* epistrefei TRUE: se periptwsi epitixias
* FALSE: se periptwsi apotixias */
int QU_enqueue(QUEUE *q,elem x)
{
if (QU_full(*q))
return FALSE;
else
{
q->finish++;
q->array[q->finish]=x;
return TRUE;
}
}
…
finish=2
2 6 4
0 1 2 3 QUEUE_SIZE-1
array
0&1: ,'* (!. . ! «5»):
…
finish=3
2 6 4
0 1 2 3 QEUEUE_SIZE-1
array
A.
2. *!"
6. )" ! C: *! %
#$
( ! # ) :
1. *! ! ( ! 2 )
2. ! " !
3. # finish ( # 1)
…
finish=2
2 6 4
0 1 2 3 QUEUE_SIZE-1
array
0&1:
,'*:
…6 4
0 1 2 3 QUEUE_SIZE-1
array
finish=1
*x=2
A.
2. *!"
6. )" ! C: *! %
##
/* QU_dequeue(): Kanei apomakrinsi tou prwtou stoixeiou tis ouras
* epistrefei TRUE: se periptwsi epitixias
* FALSE: se periptwsi apotixias */
int QU_dequeue(QUEUE *q,elem *x)
{
int i;
if (QU_empty(*q))
return FALSE;
else
{
/* 1. Apothikeysi tou stoixeiou pou eksagetai*/
*x=q->array[0];
/* 2. Aristeri metakinisi twn stoixeiwn kata mia thesi */
for (i=0; i<q->finish; i++)
q->array[i]=q->array[i+1];
/* 3. To finish meiwnetai kata 1 */
q->finish--;
return TRUE;
}
}
A.
2. *!"
7. )" ! C:
#
" " project queue.dev ! :
' queue.h ! ! "
' queue.c #
' main.c ! ! ! .
« » ! # !" " .
)! :
• ' ! ! ! " «/"# C – 14:
, . " ." # »

A.
3. + "
1. + "
#
! ! !
, ! ! .
! ! . " . " "" ." !
." (
). / ! :
enqueue(2)
2
enqueue(4)
2 4
4
dequeue( )
enqueue(5)
4
enqueue(3)
4 5
5
3
start=0
finish=0
start=0 finish=1
start=1
finish=1
start=1 finish=2
start=1 finish=3
start=-1
finish=-1
A.
3. + "
1. + "
#
/ ! ( ) ! ." , ! 2 " !
( ! ! ! )
, " !
3! !" 2 " !
!
" ." ! ! " ( ! ! 1-1 0)
4 5 3
start=1 finish=3
0 1 2 3
array
4 5 6 7
0
array
1
2
34
5
6
7 start=1
finish=3
2 61
start=6finish=0
0 1 2 3
array
4 5 6 7
0
array
1
2
34
5
6
7start=6
finish=1
4
5
3
2
6 1
A.
3. + "
2. )" ! C: "#
#
& C " :
• (struct) :
• - QUEUE_SIZE
• ." (start finish) ! "
( start=finish=-1 ).
#define QUEUE_SIZE 10 /* Megethos pinaka ouras */
typedef int elem; /* typos dedomenwn ouras */
struct queue{
elem array[QUEUE_SIZE]; /* pinakas stoixeiwn */
int start; /* arxi tis ouras */
int finish; /* telos tis ouras */
};
typedef struct queue QUEUE; /* Sinwnimo tis ouras */
* ! : 0
array
1
2
34
5
6
7 start=1
finish=3
4
5
3
A.
3. + "
3. )" ! C: * !
#
! " -1
/* QU_init(): arxikopoiei tin oura */
void QU_init(QUEUE *q)
{
q->start =-1;
q->finish=-1;
}
0&1: ,'*:
0
array
1
2
34
5
6
7
QUEUE_SIZE=8
start=??
finish=??
0
array
1
2
34
5
6
7
QUEUE_SIZE=8
start=-1
finish=-1

A.
3. + "
4. )" ! C: -" – +
#
! ." ! ." start ( ."
finish) -1
• * " ! ( 2 " ! . # !
! ! ! . " ! )
/* QU_empty(): epistrefei TRUE/FALSE
* analoga me to an i oura einai adeia */
int QU_empty(QUEUE q)
{
return q.finish==-1;
}
A.
3. + "
5. )" ! C: -" – /
#!
! ! # ." ! ." finish 1 "
! ." start ( " start==finish+1)
• ! ! ! finish=QUEUE_SIZE-1 ! ! " start==0
* ! ! 4 # :
/* QU_full(): epistrefei TRUE/FALSE
* analoga me to an i oura einai gemati */
int QU_full(QUEUE q)
{
return q.start==(q.finish+1)%QUEUE_SIZE;
}
)! :
• " % ! 2 ! " ! # (/"# C – 4).
• , # ! # " ! ! start !
, 0.
A.
3. + "
6. )" ! C: %
#"
$ ( 2 ) :
• ' finish ! ! ! :
• ' finish+1 ( finish < QUEUE_SIZE-1)
• ' 0 ( finish = QUEUE_SIZE-1)
• ' ! finish.
0&1:
0
array
1
2
34
5
6
7 start=1
finish=3
4
5
3
0
array
1
2
34
5
6
7 start=1
4
5
35
finish=4
QUEUE_SIZE=8
QUEUE_SIZE=8
5
,'* (!. . ! «5»):
A.
3. + "
6. )" ! C: %
$
/* QU_enqueue(): Eisagei to x stin oura q
* epistrefei TRUE: se periptwsi epitixias
* FALSE: se periptwsi apotixias */
int QU_enqueue(QUEUE *q,elem x)
{
if (QU_full(*q))
return FALSE;
else
{
if (QU_empty(*q))
{
q->start=0;
q->finish=0;
}
else
{
q->finish=(q->finish+1)%QUEUE_SIZE;
}
q->array[q->finish]=x;
return TRUE;
}
}

start=1
A.
3. + "
6. )" ! C: *! %
#
( ! # ) ! ( 2 ):
• *! start (# ! 2 )
:
• * start < ! QUEUE_SIZE-1, start=start+1
• * start = QUEUE_SIZE-1 start=0
0&1:
0
array
1
2
34
5
6
7 start=1
finish=3
4
5
3
0
array
1
2
34
5
6
7
5
3
QUEUE_SIZE=8
QUEUE_SIZE=8
5
,'* *x=4
finish=3
A.
3. + "
6. )" ! C: *! %
/* QU_dequeue(): Kanei apomakrinsi tou prwtou stoixeiou tis ouras
* epistrefei TRUE: se periptwsi epitixias
* FALSE: se periptwsi apotixias */
int QU_dequeue(QUEUE *q,elem *x)
{
if (QU_empty(*q))
return FALSE;
else
{
*x=q->array[q->start];
if (q->start == q->finish) /* H oura adeiase */
{
q->start=-1;
q->finish=-1;
}
else
{
q->start=(q->start+1)%QUEUE_SIZE;
}
return TRUE;
}
}
A.
3. + "
7. )" ! C:
" " project circular_queue.dev ! :
' queue.h ! ! "
' queue.c #
' main.c ! ! ! .
« » ! # !" " .
(. *
,2 1: ' ' ! $
+ ! ! ! # " ! $
+ ( ! ) . " # 80 . +
! " 5 ! " . % . " ! !# ! " .
' ! " ! ( ! ! " # ):
52 " . . $ ! !# ! " ! : *
« » ! # , ! , "" # !
. * , ! " .
* # " . ! " ! ! "
! 1 ! " . % !# !#
! ! ! .
' " . 2 , . %
! ! . $ ! ! " .
)! :
• " «! » ! ,
!" .

(. *
,2 2:
! , ! ! !
! ! $ !
( " , " ! ).
- ! " ! « » :
1 ! ! $
! .
( .
! )
+ ! ! " ! ,
! ! # "" " project ! " .
)! :
• " «! » ! ,
!" .
(. *
,2 3: , ! %
" ! .
" !
H ! !# .
,! project ! " # #
.
! ! " main, # ! .
! ! ,1 ! !
! . " .
)! : ! . ( ! !. . ! )
% ! , ! " ! ,
" .
void QU_print(QUEUE *q)
(. *
,2 4: * 2
,! project 2 3, # $ !
"# :
2 ( ! #
" , ! " , . .)
% ! . !
void QU_reverse(QUEUE *q)