1. 5
ก
ก
#include <stdio.h>
#include <stdio.h> 1
void main()
2
{
.. 3
}
ก ก 3
1. "# ก
!"#$%ก$' ()*$(+ก , Preprocessing Directive 234$567*89: 6 ก2 4; '<8*= $>ก$5?@,
ก,$ 2A B ก ก,$%#=C="#$%ก$' 2 ?(: (:;@, :! #include <stdio.h> 2346 กก6; '<8*= $>2 4 @,*DA
*A $><E=>?(:$567 ;9 stdio.h * 4,$ '2 ก,$%#="#$%ก$'A4 + "A+ก,$ก@, A preprocessing directives
()F5G4 ! H) G4 A4 +*;$9: ! ',+ # * '
;@, :!?(:234$5672 4; '<8*= $> @,*DA*A $><E=>* 4,$ '2 ก,$%#="#$%ก$' ,',$I* (+ <A4 2
$K#%66 ;9
- #include <- ./ / 01230> ; '<8*= $>F5?@,ก,$;4 ,*DA*A $><E=>?(:$567F,ก<A*$ก? $(?(:234
@, $6*กM6*DA*A $><E=>"A+*N8,5 (#กGO;9 <A*$ก? $(39: include)
- #include 5- ./ / 012306 ; '<8*= $>F5?@,ก,$;4 ,*DA*A $><E?(:$567 F,ก<A*$M;? $(
*A(+ ก ก6<E=> source code ) %G4I4,<'86กMF5<#;4 ,<A*$M;? $(?(:234*กM6*DA*A $><E=>"A+*N8,5
2. 28 ก0-# "3#ก
EP!ก>3: =ก !Q,R,S( ;9 EP!ก>3: main() SH:!"#$%ก$'Q,R,S(?7ก"#$%ก$'F5G4 !'(EP!ก>3: ()
+K2 "#$%ก$'* ' F5* M <A4F,ก39: EP!ก>3: ;9 main %#= , T =กU A! ) ก,$* (+ "#$%ก$'Q,RS(
FH! ,AEP!ก>3: ()<#<'<A4 "A+ 6* G !EP!ก>3: F5IKกก@, AA4 +*;$9: ! ',+ { %=5 } ก=, ;9 ก,$
?@,!, !EP!ก>3: F5*$O:'G4 ?(:*;$9: ! ',+ { %=5F5 O) A?(:*;$9: ! ',+ } EP!ก>3: main() ,',$I
7
* (+ 2 $K#%66 ! void main(void) กM<A4 '(; ,' ',+* '9 ก ;9 ',+; ,' , EP!ก>3: main()

2. F5<''( ,$>กO *' G> (argument) ;9 <''(ก,$$6;,2A B * 4,',#$5' =C=Q,+2 EP!ก>3: %=5F5<''(ก,$
;9 ;,2A B ก=6 ก<#F,กEP!ก>3: A4 +
<';9 ;,2A B ก=6 ก<#F,กEP!ก>3:
main() *?(+6*?, void main(void)
<'$6;,2A B * 4,',2 EP!ก>3:
argument ;9 G $6;,* 4,',2 EP!ก>3:
parameter ;9 ;,?(: !<#+!EP!ก>3:
;, ! argument %=5 parameter G4 !*#V 4 'K=3 OA*A(+ ก *3 ,กก@, A2 4 argument *#V 4 'K=
3 OAG กR$%=4 ;, parameter กM !<#กMG4 !*#V 3 OAG กR$A4 +
3. 93: 9/ ก
*#V !ก,$* (+ ;@, :! *89: 2 4"#$%ก$'?@,!, G,'?(:<A4 ก%66< 4
;0
; '*' G> (comment) ;9 ?(:*#V ',+* G7 !"#$%ก$' '(< 4*89: 2 4CK4* (+ "#$%ก$'2
4 ; ,' WO6,+ก@,ก6=!<#2 source code SH:!; '<8*= $>F5 4,',ก,$%#=C=2 ?(:*#V ; '*' G> ()
; '*' G>2 Q,R,S('( 2 %66;9
♦ ; '*' G>%666$$?A*A(+ 234*;$9: ! ',+ //
♦ ; '*' G>%66 =,+6$$?A 234*;$9: ! ',+ /* %=5 */
;# 9 ก ;0
// Comment only one line
#include <stdio.h>
#include <conio.h>
main void()
{
clrscr(); ก
/*comment
many
line*/
}

3. 4 ; $$5 !2 ก,$234; '*' G> ;9 2 ก$](?(:234; '*' G>%66 =,+6$$?A F5<' ,',$I234
; '*' G>S4 ; '*' G><A4 A!$K# 'ON5 ) F5ก 2 4*กOA 4 COA8=,A2 ก,$; '<8=>
/
/*Comment1*/ /*Comment2*/ /*Comment3*/
X
/*Comment1 /*Comment2*/ /*Comment3*/
ก - ;0 "3 9 #/
F5* M ,2 ก$](?(:G4 !ก,$2 ; '*' G> =,+ B 6$$?AGOAก ) ; '*' G>%66 =,+6$$?AF5
3 +#$5 +A* =,2 ก,$2 ; '*' G><A4',กก ,ก,$234; '*' G>%666$$?A*A(+ %GกM; $$5'A$5 !2
ก,$234!, A4 +

4. ;# 9 1 ก " #ก 9 <=ก ก
1: #include <stdio.h>
2: void main()
3: {
4: clrscr();
5: printf("My name is Kwanjit");
6: }
>33#?@0 ก
My name is Kwanjit
@A 9 ก
6$$?A?(: 1: *#V ก,$6 ก2 4; '<8*= $> @,*DA*A $><E=>39: stdio.h * 4,',$ '2 ก,$%#=C=
A4 + "A+ stdio + ',F,ก standard input/output %=5 .h ;9 ,' ก7= !*DA
*A $><E=>2 Q,R,S( (h + ',F,ก header) SH:! stdio.h ;9 *DA*A $><E=>?(:$ '* ,
ก,$#$5ก,j (declaration) !EP!ก>3: ',G$k, !Q,R,S(?(:*ก(:+ ก6ก,$FAก,$
A4, O 87 G%=5* ,G> 87 G* 4, ',< 4 A4 +ก "#$%ก$' ()'( ก ,$*$( + ก234 ! , EP ! ก> 3:
printf() *89: % A! 4 'K= ก?,!F Q,8 %=5* 9: !F,ก !ก,$#$5ก,j
EP!ก>3: printf() IKก6$$F7 +K2 *DA*A $><E=> stdio.h A! ) FH!F@,*#V G4 ! @,*DA
*A $><E=> stdio.h * 4,$ '2 ก,$%#=C=A4 +
6$$?A?(: 2: ;9 EP!ก>3: void main() SH:!*#V EP!ก>3: =ก !"#$%ก$' ก,$?@,!, !
"#$%ก$'Q,R,S(F5*$O:'G4 ?(:EP!ก>3: ()
6$$?A?(: 3: *;$9: ! ',+ { $567F7A*$O:'G4 !EP!ก>3: main()
6$$?A?(: 4: *#V ;@, :!2 4*;=(+$> 4,F * =,% A!C==8W>
6$$?A?(: 5: *#V ก,$*$(+ก234EP!ก>3: printf() SH:!*#V EP!ก>3: ',G$k, !Q,R,S(?@, 4,?(:
% A!C= 4 'K= ก?,!F Q,8 2 ?(: ()F5% A! 4 ; ,' My name is Kwanjit
ก?,!F Q,8
6$$?A?(: 6: *;$9: ! ',+ } $567F7A O) 7A !EP!ก>3: main()