1. 1.
13
2.
14
3.
19
4.
21
5.
22
6.
23

2. 6/1
30212
1 2555

3. 1
1-2
2

4. 2
-
2-4
-
5
-
6-7
-
7
-
8-9
-
9-10
-
10-12
13
-
13-15
-
15-16
-
16-17

5. 18
19-20
20
mind map
Function)

6. type int , float ,
char , double , void
void
int
function_name
type parameter parameter ,
N
parameter void
{
location variable declaration

7. statement_ ; statement_ ; ... statement_N
return(value);
void)
return
}
1. User-defined
Function)
2. Standard Function)
include directives header
file
1)

8. type function_name(type1
arg1, type2 arg2,.., typeN argN)
{
local variable declaration;
statement(s);
return( varlue);
}
1.1
type
type int, float, char
double int
type void
function_name
type1 arg1, type2 arg2,…, typeN argN

9. argument 1, 2,
3,…, N
void
{
}
local variable declaration
local
statement(s) 1
; (semicolon)
return(value)
value ()
#include<stdio.h>
#include<conio.h>
void one(void); /* function Prototype
void two(void); /* function Prototype
void main(void)
{
clrscr();
one(); /* call one() */
two(); /* call two() */
printf("nPress any key back to program ...");
getch();
}

10. /* one function */
void one()
{
int a=5, b=7;
printf("A = %d, B = %dn",a,b);
}
/* two function */
void two()
{
float p=4.5, q=3.5;
p+=q;
printf("P = %6.3f, Q = %6.3fn",p,q);
}
•
•
•
•
–
–
–
1.2
2
1.
2.
#include <stdio.h>

11. Main ()
{
Function-name2 ();
…………………...
Function-name1 ();
}
#include <stdio.h>
Main ()
{
Function-name1 ();
Function-name2 ();
…………………..
}
1.
#include
2.
1.3

12. ()
void
function_name(void )
#include<stdio.h>
#include<conio.h>
void asterisk_line(void);
void main(void)
{
clrscr( );
asterisk_line( );
printf("****** C and C++ PROGRAMMING ******n");
asterisk_line();
printf("nPress any key back to program ...");
getch();
}
/* asterisk_line function */

13. void asterisk_line( )
{
int j, n=40;
for(j=1; j<=n; j++)
printf("*");
printf("n");
}
1.4
void
function_name (type_parameter parameter_name [,..] ) ;
function_ name
type_parameter
parameter_name
1 ,
#include <stdio.h>

14. Void addition (int , int ) ;
Void main ()
{
Int a,b ;
……....
Addition (a,b) ;
}
Void addition (int m , int n)
{
…............
}
1.5
Type_variable function_name parameter_name,… ;
Type_variable
function_name

15. parameter_name
#include<stdio.h>
#include<conio.h>
int calculate(int, int);
void main(void)
{
int p=3, q=4, r;
clrscr( );
r = calculate(p,q);
printf("P = %d, Q = %d, R = %dn",p,q,r);
printf("nPress any key back to program ...");
getch();
} /* end main() */
int calculate(int p, int q)
{

16. return (p+q);
}
1.6
variable_name = function_name();
variable_name
return (value)

17. 7
(Local Variable)
(Global Variable)
(
)
/* 7th Sample Program: Local vs Global Variable */
#include<stdio.h>
int ans = 0;
int inc_one(int); /* function prototype */
void main()
{
int a = 3;
ans = inc_one(a);
printf(“Answer is %dn”, ans);
}
/* function definition: return x+1 */
int inc_one(int x)
{
int ans;
ans = x + 1;
return ans;
}

18. ans
(main)
ans
a
inc_one x ans
ans ans
inc_one ans
inc_one
ans
inc_one ans
ans
C
Header #include
#include<stdio.h>
Square root 4 = 2.000000
5 power 3 = 125.000000

19. #include<math.h>
void main()
{
printf(“square root 4 =”);
printf(“%fn”, sqrt(4));
printf(“5 power 3 =”);
printf(“%f”, pow(5,3));
}
include .h
• printf scanf include
stdio.h
• sqrt pow
include math.h
math.h
double
double

20. sin(), cos() tan()
sin(x) sine x
cos(x) cosine x
(radian)
tan(x) tangent x
(radian)
sqrt(x) x x
exp(x) ex e
pow(x,y) xy
log(x) log e natural logarithm
x

21. log10(x) log x
ceil(x) x x
floor(x) x x
fabs(x)

22. string.h)• string.h
–strcat( 1, 2)
–strcpy( ,
–strlen(
–strcmp( 1, 2)
-strcmpi ( 1, 2)
2.3
#include <ctype.h>
TOLOWER
LOWER
TOLOWER(text)

23. text
TOUPPER
UPPER LOWER
TOUPPER
TOUPPER(text)
text

25. 4
-
4.
–

26. printf
#include
1. char s3[5] = {‘G’, ‘O’, ‘O’, ‘D’, ‘0’}; s3
ก.
ข.
ค. . .
ง.
2.
ก.
ข.
ค. .
ง.
3.

27. ก. int function_name(type arg, …)
ข. void function_name(type arg, …)
ค. function_name(type arg, ….)
ง. void function_name()
4.
ก.
ข.
ค.
ง.
5.
ก.
ข. {}
ค. []
ง.
6. char s1[9] = “LANGUAGE”; s1
ก.
ข.
ค. . .
ง.
7. char s2[4] = {‘G’, ‘O’, ‘O’, ‘D’}; s2

28. ก.
ข.
ค. . .
ง.
8.
ก. function_name();
ข. function_name()
ค. function_name(arg1,arg2)
Function_name(arg1; arg2);
9.
ก. int function_name(type arg, …)
ข. void function_name(type arg, …)
ค. function_name(type arg, ….)
void function_name()
10.
ก. getchar()
ข. gets()
ค. fgets()
ง. get (
1. 6.
2. 7.
3. 8.
4. 9.
5. 10.

29. . 7 C
http://e-
learning.snru.ac.th/els/program lesson page _ html
21 2555.
. .
http://charinya-
lru.com/charinyadocuments/subjects/ _ch _ppt.pdf
17 2555
http:// ~boo
nchoo/images/stories/ _function_I.pdf 19 2555
30201
http://www.gliffy.com 29
2555
http://uhost.rmutp
.ac.th/kriengkri.l/w3.pdf 18 2555
http://www.mk-job.com/bbs/thread-3897-1-1.html. 26 2555