Η Γλώσσα C - Μάθημα 3
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H C
3:
.
1.
2.
1.
1.
2.
3.
2.
3.
1.
2.
3.
4.
4.
1. typedef
.
1.
2.
1. #define
2. H - const
.
2 , C, 3:
3 , C, 3:
.
C :
,
,
.
,
.
,
(. x), (.. x 1000),
(. x=3)
(. x )
x c y
2 6 4 1000 1004 1008
A. 1.
4 , C, 3:
. ()
, :
( )
(a-z, A-Z)
(0-9)
underscore ( _ )
underscore ( ).
- (case-sensitive). sum
sUm Sum.
- (
, include ..)
A. 1.
5 , C, 3:
:
,
. ..
, sum,
.. z.
.
2
:
N _, .. interest_rate
2 , .. interestRate
A. 2.
6 , C, 3:
.
.
.
,
.
,
,
- 2
15
,
...
A. 2. 1.
7 , C, 3:
C .
,
bytes .
:
(char, int, long, short)
(float, double)
A. 2. 1. (1. )
8 , C, 3:
,
.
: bytes
, :
bytes
char 1 -128 127
short 2 -32768 32767
int 4 -2147483648 2147438647
long 4 -2147483648 2147438647
A. 2. 1. (2. )
9 , C, 3:
,
.
9
.
bytes
unsigned char 1 0 255
unsigned int 2 0 65535
unsigned int 2 0 65535
unsigned long 4 0 4294967295
A. 2. 1. (3. )
10 , C, 3:
float double bytes
( ) .
:
float 7
double 19 .
bytes
float 4 1.2x10-38 3.4x1038
double 8 2.2x10-308 1.8x10308
float 4 1.2x10-38 3.4x1038
double 8 2.2x10-308 1.8x10308
A. 2. 1.
11 , C, 3:
.
.
:
int:
long:
float:
double:
A. 2. 1.
12 , C, 3:
bytes
.
sizeof bytes
.( )
.
/* sizes.c: Provallei stin othoni ta megethi se bytes twn tipwn dedomenvn */
#include
main()
{
printf("\nTa bytes enos char einai: %d", sizeof(char));
printf("\nTa bytes enos short einai: %d", sizeof(short));
printf("\nTa bytes enos int einai: %d", sizeof(int));
printf("\nTa bytes enos long einai: %d", sizeof(long));
printf("\nTa bytes enos unsigned short einai: %d", sizeof(unsigned short));
printf("\nTa bytes enos unsigned int einai: %d", sizeof(unsigned int));
printf("\nTa bytes enos unsigned long einai: %d", sizeof(unsigned long));
printf("\nTa bytes enos float einai: %d", sizeof(float));
printf("\nTa bytes enos double einai: %d", sizeof(double));
}
A. 2. 2.
13 , C, 3:
( ),
:
( ).
.
.
. .
A. 3. 1.
14 , C, 3:
, .
:
_
_
,
:
3
.
_ _;
_ _1, _2, _3;
A. 3. 2.
15 , C, 3:
:
3 x,y,z
2 percent, amount
:
.
int x,y,z;
float percent, amount;
int x;
int y;
int z;
float percent, amount;
,
.
:
int x,y,z
:
x z y
A. 3. 3.
16 , C, 3:
:
.
, , bytes
.
:
..
5
5.5 4.44 .
int x=5;
float y=5.5, z=4.44;
A. 3. 3.
17 , C, 3:
x 5.
:
! = ( )
, .
( )
.
int x=5;
int x;
x=5;
A. 3. 4.
18 , C, 3:
12: ,
.
:
main
.
, main
,
.
( main)
( main
)
A. 3. 4.
19 , C, 3:
12: ,
.
:
main
.
, main
,
.
( main)
( main
)
#include
int function(int x); //
int g; /* g . main f */
main()
{
int m; /* m . main */
...( main)...
}
int function(int x) // {
int k; /* H k . f() */
...( function)...
}
A. 4. 1. - typedef
20 , C, 3:
H C .
typedef :
__
__
, int akeraios,
int
typedef #include
.
typedef.
typedef __ __;
typedef int akeraios;
A. 4. 1. - typedef
21 , C, 3:
12: ,
.
:
main
.
, main
,
.
( main)
( main
)
/* typedef.c: Paradeigma xrisis tis entolis typedef */
#include
typedef int akeraios;
main()
{
akeraios x,y,z;
printf("Dwste enan akeraio: ");
scanf("%d",&x);
printf("Dwste akomi enan akeraio: ");
scanf("%d",&y);
z=x+y;
printf("To athroisma toys einai: %d", z);
}
A. 4. 1. - typedef
22 , C, 3:
m .
.
(
), typedef !
. 1.
23 , C, 3:
,
( .. )
C, ,
, .
3 ( )
:
. .. 2,
C
(int)
. C 2 :
( . ) (.. 3.45)
(.. 1.23e6
1.23x106=1230000)
. 2.
24 , C, 3:
,
.
(..
),
.
.
, :
#define
const
m. .
, :
#define
( )
const
.
. 2. 1. #define
25 , C, 3:
#define :
:
! !
#define #include.
define PI
.
PI
#define _ _
#define PI 3.1415
. 2. 2. - const
26 , C, 3:
,
.
const .
! !
100 :
!
const
( main)
const int x=100;
. 2. 2. - const
27 , C, 3:
const
.
,
!
, ,
.
.
C,
.
. 4. 2. - const
28 , C, 3:
const
.
,
!
, ,
.
.
C,
.
/* statheres.c: Programma poy deixnei tin xrisi statherwn */
#include //1.grafoume ta arxeia kefalidas
#define N 100 //2.Grafoume odigies define statherwn
//3. Edw mporoume na orisoume katholikes metavlites
//4. Edw mporoume na orisoyme prwtotipa sinartisewn
main()
{
//5.1 Dilwsi statherwn kai metavlitwn tis main int i,sum;
const int number=10;
//5.2 entoles tis main
for (i=number; i
. 1
29 , C, 3:
C :
1. 100 const
2.
3.
4.
