ภาษา C
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1. The document discusses various mathematical functions in C language such as trigonometric, logarithmic, exponential and power functions. It provides examples of using functions like sin, cos, sqrt, exp, pow in a C program. 2. Character handling functions and string functions are also covered. Examples of character classification functions like isalpha and string functions like strlen, strcmp are given. 3. The document explains user-defined functions in C - how to define, call and pass arguments to functions. Examples of functions that return or not return values are provided.
ภาษา C
- 2. ก C ก ก C !" # ก $#!% " ก& ' ( ( ( ก ) * + #, ก ( - (. -* C $!% /" / 0 ก1 $ % header file C ' ก1 $ % 0 2) () ) ก3 *.h * & ( ( #, ก ( /" / "ก ก " # 0ก )" " (.6% /" # 0ก ) /" / ) % " ! " ( * )' )*% ก / & !" " "!/ 0* ก )! * $# 7.1 ก (standard functions) #, ก ( - (. -* C $!% /" / 0 ก1 $ % header file C ' ก1 $ % 0 2) () ) ก3 *.h * & )( *% ก % ก ! *% 6% ก "6 header file ! ก '" % ' ( #include<header file.h> /% ) * *% / # 0ก ) ) % ก (*% ก $!% 8( ก ) * + #, ก ( - .6%. -* C compiler /" / 9( %.6% % $# " ก /" # 0ก ) %ก /" # 0ก ) ! ก0 "/ ' "ก ก ) * + :$ ก : (library functions)
- 3. ก )*+ ( ก /% ก <9 ก ) * + ( #, 0 "ก % "& 8( )! * $# 7.1.1 ก (mathematic functions) #, ก ( % ก ' = '=-*> * 0 ก ( % ก # *% %' ( #include <math.h> 0 ก "6* *% / # 0ก ) 0 * 0# ( % ก # *% ) -! (type) #, double ( ก. 9? ($!% ก ก # $!%' ก / /% )6 #, double ก ก ! acos(x) asin(x) atan(x) sin(x) cos(x) tan(x) sqrt(x) exp(x) pow(x,y) log(x) log10(x) ceil(x) floor(x) fabs(x)
- 4. 1) ก acos(x) #, ก ( %' = ' arc cosine / x !" ( x #, ' )3) " !" (radian) 6#0 acos(x); 2) ก asin(x) #, ก ( %' = ' arc sine / x !" ( x #, ' )3) " !" 6#0 asin(x); 3) ก atan(x) #, ก ( %' = ' arc tan / x !" ( x #, ' )3) " !" 6#0 atan(x);
- 5. 4) ก sin(x) #, ก ( %' = ' sine / x !" ( x #, ' )3) " !" 6#0 sin(x); 5) ก cos(x) #, ก ( %' = ' cosine / x !" ( x #, ' )3) " !" 6#0 cos(x); 6) ก tan(x) #, ก ( %' = ' tan / x !" ( x #, ' )3) " !" 6#0 tan(x);
- 6. 9( ' ) /% ก % ก acos(x), asin(x), atan(x), sin(x), cos(x) 0 tan(x) ) ก"-( / %>ก # 0ก )* " * $# "# $ก %&' 7.1 0 ! ก % ก acos(x), asin(x), atan(x), sin(x), cos(x) 0 tan(x) * math1.c */ #include<stdio.h> /* ! ( 1 */ #include<math.h> /* ! ( 2 */ #include<conio.h> /* ! ( 3 */ void main(void) /* ! ( 4 */ { /* ! ( 5 */ double r, pi = 3.141592654; /* ! ( 6 */ r = pi/180; /* ! ( 7 */ clrscr(); /* ! ( 8 */ printf("%fn",asin(r)); /* ! ( 9 */ printf("%fn",acos(r)); /* ! ( 10 */ printf("%fn",atan(r)); /* ! ( 11 */ printf("%fn",sin(r)); /* ! ( 12 */ printf("%fn",cos(r)); /* ! ( 13 */ printf("%fn",tan(r)); /* ! ( 14 */ printf("nPress any key back to program ..."); /* ! ( 15 */ getch(); /* ! ( 16 */ } /* ! ( 17 */
- 7. ())*+ , -. ก"# $ก
- 8. ' ?- " # 0ก ) ก # 0ก )* " ( 7.1 ) ?- "ก / # 0ก ) ( 'N & $!%! ! ( 9 ' ( printf("%fn",asin(r)); ก ' = ' arc sin / * 0# r !" r #, )3) " !" 0 0 ! . 9? ($!% ก 9 ! ( 10 ' ( printf("%fn",acos(r)); ก ' = ' arc cosine / * 0# r !" r #, )3) " !" 0 0 ! . 9? ($!% ก 9 ! ( 11 ' ( printf("%fn",atan(r)); ก ' = ' arc tan / * 0# r !" r #, )3) " !" 0 0 ! . 9? ($!% ก 9 ! ( 12 ' ( printf("%fn",sin(r)); ก ' = ' sine / * 0# r !" r #, )3) " !" 0 0 ! . 9? ($!% ก 9 ! ( 13 ' ( printf("%fn",cos(r)); ก ' = ' cosine / * 0# r !" r #, )3) " !" 0 0 ! . 9? ($!% ก 9 ! ( 14 ' ( printf("%fn",tan(r)); ก ' = ' tan / * 0# r !" r #, )3) " !" 0 0 ! . 9? ($!% ก 9 ! ( 15 0 16 9-)9/% ' ) %ก!'" ! & 9( ก 6 # 0ก ) 0 "3! ' ! & ก! enter ก /% 6 # 0ก ) /* ! ( 17 */
- 9. 7) ก sqrt(x) #, ก ( % ' ก ( 2 (square root) / ' ' ( * 0# x !" ( x *% #, ' ' ( -! * / * 0# )' $)*-! ( 6#0 sqrt(x); 8) ก exp(x) #, ก ( % ' ex !" ( x #, ' ' ( * 0# ( % #, ' "กก / e !" ( e )' # ) = 2.718282 6#0 exp(x); 9) ก pow(x,y) #, ก ( % ' xy !" ( x #, ' ' ( * 0# ( % #, * + 8( *% )' ) กก >6 " y #, ' ' ( * 0# ( % #, ' "กก 6#0 pow(x, y);
- 10. 1.2 ก ก(" ก * ก (character functions) #, ก ( %ก /% )6 ) -! #, single char ( ( % ( 1 byte) 0 ก ( % ก # *% %' ( #include<ctype.h> 0 ก "6 * *% / # 0ก ) ) "ก % ก # $!% ก ก(" ก * ก ( 'N isalnum(ch), isalpha(ch), isdigit(ch), islower(ch), isupper(ch), tolower(ch), toupper(ch), isspace(ch), isxdigit(ch) 1.3 ก ก(" ก * - (string functions) #, ก ( ก /% )6 -! * - (string) % !"ก ( % ก # *% %' ( #include<string.h> 0 ก "6* *% / # 0ก ) "ก "ก % ก # $!% ก ก(" ก * - ( 'N strlen(s), strcmp(s1,s2) , strcpy(s), strcat(s1,s2) 1.4 ก ( $# ( % "& ก clrscr( ) #, ก ( % ก /% )6 ก ก 90 text mode ก gotoxy(x,y) #, ก ( ' ( %* * 0 % (cursor) ' ( ($#" * 0 ( 3$ % 9 ก sizeof(x) #, ก ( %* / !/ * 0# x )/ !ก( Byte
- 11. 2. ก ( /" / (user defined functions) ก ( /" / ' "ก # 0ก )" " ' / # 0ก ) ( /" / 9( % ) $!% " ! " ( * )' ) *% ก .6% /" # 0ก ) C -") "ก # 0ก )" " : ก : .6% ( /" # 0ก ) # ' ' 0 -ก -") "ก : # 0ก )" ": " $ ก1* ) # 0ก )" " ก ก1) ก = ก ) ก 9" 0* "ก ( * ก ก "ก ก 8( #, ก " 6% ก(" ก ( /" / (user define functions : UDF) * 0*ก # ก > 6#0 ก ก /" * ก 0 ก "ก % ก 9( % ) % ก ( /" / # 0ก ) C $!% " 6ก*% ก /" ก / ) % " ! " ( ) 0 ก ก ( /" / * ) ก = ก ' $#0 ' ก $!% 3 0 ' 2.1 ก ($))ก ' $#0 'ก 2.2 ก )ก ' $#0*$)) ' ก ( 2.3 ก ) ก ' $#0 ( 'ก 8( ก 0* 0 ก1 ) ก 0* " ! .6% /" ก #, ( *% >ก ' ) /% ก 0* 0 9( $!%) # "3ก* %ก $!% " ) )
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