# C 6η διάλεξη

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• 1 () 101 () 101 / & / &

. .

. .

**********--mail: mail: [email protected]@ced.tuc.gr**********Web: Web: http://www.ece.tuc.gr/http://www.ece.tuc.gr/kmaniakmaniaOffice: 145 A14Office: 145 A14Office: 145.A14Office: 145.A14Tel: 28210 37222Tel: 28210 37222

::http://courses.ced.tuc.grhttp://courses.ced.tuc.gr

. .intint data[1000];data[1000];

data[0] data[0] data[999]data[999]

KK ..intint data[1000];data[1000];intint count;count;count=100;count=100;data[count]=12; /* data[count]=12; /* data[100]=12 */data[100]=12 */

• 2

. . main() main() main().main().H H C C . .

()()

( (iterative statements) iterative statements) CC . . CC , , :: whilewhile dodo--whilewhile forfor ( (body)body) . . ( (condition)condition). . ((fixed fixed point)point)..

.. ( (structurestructure) ) (.. (.. ( ( ). ). . . ( (statementstatement commandcommand) ) (.. (.. CC) . ) . CC ( (iterative structures). iterative structures).

forfor block block . . forfor . .for (for ( ;; ;; ;;))for (for ( ; ; ;; ;;));; ; ; ;; ;; C C C.C.

• 3 forfor . . . . . . .. ( ) ( ) ( ) ( ) for for oo.. C C . . . .for (for (; ; ;; ;;));;

forfor for for

for for ((; ; ; ))

::#include

int count;

main () {for (count = 1; count

• 4 forfor for for

for for ((; ; ; ))

::#include

int count;

main () {count = 0

for (printf(Counting); count < 20; count+=5){

printf(%d\n, count);

return 0;}

Counting 0

5

10

15

To printf(Counting) for

forfor for for

for for ((; ; ; ))

::#include

int count;

main () {count = 0

for (printf(Counting) ; count < 20;){

printf(%d\n, count+=5;);

return 0;}

Counting 5

10

15

To printf(Counting) for

forfor for for

for for ((; ; ; ))

::#include

int count;int array[1000];

main () {

for (count = 0; count < 1000; array[count++] = 50){

;

}

, 50 . for

forfor for for

for for ((; ; ; ))

::#include

int count;

main () {

for (count = 0; count < 1000 && array[count]; count++){

printf(%d, array[count]);

}

H for 0

• 5 forfor for for

for for ((; ; ; ))

::#include

int count;

main () {

for (count = 0; count < 1000 && array[count] != 0;){

printf(%d, array[count++]);

}

H for 0

forfor for for

for for ((; ; ; ))

::#include int i, sum=0;main () {

for (i = 1; i

• 6 1 1 nn..

#include #include int i, n;int i, n;, ;, ;main() {main() {printf(Enter the max number to compute the square: );printf(Enter the max number to compute the square: );

scanf(%d, &n); scanf(%d, &n); for (i = 1; i

• 7 whilewhile

main ()main (){{count = 1;count = 1;

while (count

• 8 whilewhilewhile (while () )

. . ( ) ( ) whilewhile while while . . ( ( ) ) C C block block .. 1. 1.

whilewhilewhile (while () )

while while bl kbl k block block ( ) . ( ) . , , while while ( ( while while do whiledo while)). .

1 10. 1 10.

#include #include

main() main() {{{{

int i = 1;int i = 1;int sum = 0;int sum = 0;while (i

• 9 do whiledo while do while do while

do do while while (()

. .

::#include #include int i = 0;int i = 0;

main()main(){ { do do

{ { printf(The number is: %dprintf(The number is: %d\\n, i);n, i);i = i + 1;i = i + 1;

}}while (i 0 */

if( sum

• 10

int i;int i;for(i = 1; i

• 11

E selection 1 4,

( (loops)loops) ( (nested loops)nested loops).. , , ..

#include main() {main() {

intint k, x, sum = 0;k, x, sum = 0; (1*2 + 1*3 + 1*10) +

k=1

5

x=2

10 * *xx

for(k=1; k

• 12

3 3

1

True

1

, 2 , .

2False

3 3

True

False

1

False

True

False

1 , 2 , .

2True

3 3#define TRUE 1#define TRUE 1#define FALSE 0#define FALSE 0

void main() {void main() {intint flag;flag;

flag = TRUE;flag = TRUE;while (flag)while (flag) /*/* while (flag !=0) */while (flag !=0) */

(flag)

1while (flag) while (flag) / / while (flag !=0) /while (flag !=0) /

{{ 1 1;;if (if ( ) )

{{flag = FALSE;flag = FALSE;

}}elseelse

{{ 2;2;

}}}}

}}

2

True

False

A true, flag false o while

3 3#define TRUE 1#define TRUE 1

void main() {void main() {

while (TRUE) /* while (TRUE) /* */ */

loop break

{{ 1 1;;if (if ( ) )

break;break; 2;2;

} } }}

break if { }. break .

2

True

False

1

• 13

3 3 . . . . . . breakbreak . . breakbreak . .

XX

, , .. . .intint data[1000]data[1000] datadata intint 10001000intint data[1000],data[1000], datadata intint 1000 1000 ..datadata[0] [0] datadata[999].[999].intint data[1000];data[1000];intint count;count;count = 100;count = 100;data[count] = 12; /*data[count] = 12; /* data[100] = 12; data[100] = 12; */*/

. . 0 0 0 0 1.1.

• 14

XX

, , . . . .

() () ..float expenses [12];float expenses [12];p [ ]p [ ]H H expensesexpenses 12 12 floatfloat.. 0 0 11. 11. . .

XX

expenses [1] = 100;expenses [1] = 100;H H 100 100 . .

[8][8] [9][9]expenses [8]expenses [8] == expenses [9];expenses [9];expenses [1+2] = 100; expenses [1+2] = 100; expenses expenses [[33] = 100; ] = 100; expenses[a[2]] = 100; a[2] expenses[a[2]] = 100; a[2] ..

XX

. . . . 1 1 n, n, 0. 0.

• 15

sizeof() bytes

. . 2 . 2 .i ti t h k [8][8]h k [8][8] 64 64 h kh kintint checker [8][8]; checker [8][8]; 64 , 64 , checker checker [0][0],checker[0][1]. [[0][0],checker[0][1]. [ 8 8 .] 8 8 .] ! !

#define MONTHS 12#define MONTHS 12

intint array[MONTHS];array[MONTHS]; #define #define . .

intint arrayarray[12[12];];

DEFINE DEFINE ::const const intint MONTHS = 12;MONTHS = 12;intint array[MONTHS];array[MONTHS];

• 16

int array[4] = {100, 200, 300, 400 };int array[4] = {100, 200, 300, 400 };To To ::int array[] = {100, 200, 300, 400 };int array[] = {100, 200, 300, 400 };int array[10] = {1,2,3 };int array[10] = {1,2,3 };

MM , , ..

::intint array [4][3] = { 1,2,3,4,5,6,7,8,9,10,11,12 array [4][3] = { 1,2,3,4,5,6,7,8,9,10,11,12

};};array[0][0] = 1array[0][0] = 1array[0][0] 1 array[0][0] 1

array[1][0]=4array[3][1]=11, array[1][0]=4array[3][1]=11, array[3][2]=12array[3][2]=12

::intint array [4][3] = { { 1,2,3}, {4,5,6}, {7,8,9}, array [4][3] = { { 1,2,3}, {4,5,6}, {7,8,9},

{10,11,12} };{10,11,12} };

AA 500 500 float float 500 * 4 500 * 4 bytesbytes

• 17

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