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Full Discussion: Pure C function pointer on printing vowels twice
Top Forums Programming Pure C function pointer on printing vowels twice Post 302997654 by yifangt on Wednesday 17th of May 2017 04:54:17 PM
Old 05-17-2017
Thanks Don and corona688!
I think my problem is my mis-understanding of the function putchar(c) so that I re-wrote it with putc() which helped me understand it.
Code:
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>

/*Print a char twice like putchar, return char if successful, or EOF on error.*/

int putcharTwice(int c)
{
    if (putc(c, stdout) == EOF || putc(c, stdout) == EOF)  {//Q1
    return EOF;
    } else {
    return 0;        //NOT return c;
    }
}

#define NUM_CHARS (UCHAR_MAX + 1)    //UCHAR_MAX is in limits.h

  int (*table[NUM_CHARS]) (int);   //Q2, So moved outside main() to see this function pointer

int main(int argc, char **argv)
{
/*This declares table as array of function pointers */
    int i;
    int c;

    for (i = 0; i < UCHAR_MAX; i++) {
    // default is to call putchar 
    table[i] = putchar;
    }

    // but lower-case vowels show up twice 
    table['a'] = putcharTwice; //Q3, and following 4 lines
    table['e'] = putcharTwice; //Q3
    table['i'] = putcharTwice; //Q3
    table['o'] = putcharTwice; //Q3
    table['u'] = putcharTwice; //Q3

    while ((c = getchar()) != EOF) {
    table[c] (c); //Q4,
    }
    return 0;
}

Thanks a lot again!
 

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LEARN ABOUT OSF1

tactis

TACTIS(5)							File Formats Manual							 TACTIS(5)

NAME

       TACTIS, tactis - A character encoding system (codeset) for Thai.

DESCRIPTION

       The  TACTIS  (Thai  API Consortium/Thai Industrial Standard) codeset consists of the following two character sets: ASCII (ISO 646-1983) TIS
       620-2533

	      These characters are 8-bit coded, ranging from 00 to FF.

   ASCII Characters
       In the TACTIS codeset, all ASCII characters are implemented in the form of single-byte, 7-bit characters; that is, the most significant bit
       (MSB) of ASCII characters is always set off. For more information, refer to ascii(5).

   TIS 620-2533 Characters
       The TIS 620-2533 character set includes 89 characters that are categorized as follows: Consonants: 44 Vowels: 18 total (5 leading vowels, 6
       following vowels, 2 below vowels, and 5 above vowels) Tone marks: 4 Diacritics: 5  (4 above diacritics and 1 below  diacritic)  NonComposi-
       bles: 8 (1 nobreak space, 10 Thai digits, 6 Thai special characters, and 1 word separator)

									      Note

	      Thai  digits are not recognized by the isdigit(), iswdigit(), isxdigit(), and iswxdigit(), isalnum(), and iswalnum() functions. Many
	      applications make assumptions about how a digit character can be converted to its numeric equivalent. Changing the functions to rec-
	      ognize Thai digits would break these applications.

   Code Ranges in the TACTIS Codeset
       In  the	TACTIS	codeset,  the most significant bit (MSB) of a byte is set on in codes for TIS 620-2533 characters. This differentiates TIS
       620-2533 character code from ASCII character code.

       Following are the code ranges for each of the five categories of Thai characters in the codeset:

       --------------------------------------------------
       Category 		  Code Range (hex)
       --------------------------------------------------
       Consonants		  A1 to CE
       Leading vowels		  E0 to E4
       Normal following vowels	  D0, D2, D3, E5
       Special following vowels   C4, C6
       Below vowels		  D8, D9
       Above vowels		  D1, D4 to D7
       Tone marks		  E8 to EB
       Above diacritics 	  E7, EC to EE
       Below diacritics 	  DA
       Nobreak space		  A0
       Thai digits		  F0 to F9
       Thai special characters	  CF, DF, E6, EF, FA, FB
       Word separator		  DC
       --------------------------------------------------

       In TACTIS, the hexadecimal code points of TIS 620-2533 characters are as follows:

	A0 NO-BREAK SPACE      C0 PO SAMPOW	   E0 SARA E
	A1 KO KAI	       C1 MO MA 	   E1 SARA AE
	A2 KHO KHAI	       C2 YO YAK	   E2 SARA O
	A3 KHO KHUAT	       C3 RO RUA	   E3 SARA AI MAIMUAN
	A4 KHO KHWAI	       C4 RU		   E4 SARA AI MAIMALAI
	A5 KHO KHON	       C5 LO LING	   E5 LAKKHANGYAO
	A6 KHO RAKHANG	       C6 LU		   E6 MAIYAMOK
	A7 NGO NGU	       C7 WO WAEN	   E7 MAITAIKHU
	A8 CHO CHAN	       C8 SO SALA	   E8 MAI EK
	A9 CHO CHING	       C9 SO RUSI	   E9 MAI THO
	AA CHO CHANG	       CA SO SUA	   EA MAI TRIE
	AB SO SO	       CB HO HEEP	   EB MAI CHATTAWA
	AC CHO CHOE	       CC LO CHULA	   EC THANTHAKHAT
	AD YO YING	       CD O ANG 	   ED NIKHANHIT
	AE DO CHADA	       CE HO NOKHUK	   EE YAMAKKAN
	AF TO PATAK	       CF PAIYANNOI	   EF FONGMAN
	B0 THO THO THAN        D0 SARA A	   F0 THAI ZERO
	B1 THO NANGMONTHO      D1 MAI HAN-AKAT	   F1 THAI ONE
	B2 THO PHOO THAO       D2 SARA AA	   F2 THAI TWO
	B3 NOR NANE	       D3 SARA AM	   F3 THAI THREE
	B4 DOR DEK	       D4 SARA E	   F4 THAI FOUR
	B5 TO TAO	       D5 SARA EE	   F5 THAI FIVE
	B6 THO THUNG	       D6 SARA UR	   F6 THAI SIX
	B7 THO THAHAN	       D7 SARA UUR	   F7 THAI SEVEN
	B8 THO THONG	       D8 SARA U	   F8 THAI EIGHT
	B9 NO NU	       D9 SARA UU	   F9 THAI NINE
	BA BO BAIMAI	       DA PHINTHU	   FA ANGKHANKHU
	BB PO PLA	       DB		   FB KHOMUT
	BC PHO PERNG	       DC WORD SEPARATOR   FC
	BD FO FA	       DD		   FD
	BE PO PAN	       DE		   FE
	BF FO FAN	       DF BAHT		   FF

       For more information on Thai characters, refer to Wototo(5).

   Fonts for TIS 620 2533
       The operating system provides both screen and printer fonts for TIS 620 2533 characters.

       The following bitmap fonts reflect various sizes and typefaces for 75dpi and 100dpi display devices:

       -adecw-screen-medium-r-normal--14-140-75-75-p-70-tis620.2533-1	 -adecw-screen-medium-r-normal--18-180-75-75-p-80-tis620.2533-1    -adecw-
       screen-medium-r-normal--24-240-75-75-p-120-tis620.2533-1   -adecw-screen-medium-r-normal--14-140-100-100-p-70-tis620.2533-1  -adecw-screen-
       medium-r-normal--18-180-100-100-p-80-tis620.2533-1 -adecw-screen-medium-r-normal--24-240-100-100-p-120-tis620.2533-1

       The operating system provides the following Thai fonts for PostScript  printers:  AngsanaUPC-Bold  AngsanaUPC-BoldItalic  AngsanaUPC-Italic
       AngsanaUPC-Light  CordiaUPC-Bold CordiaUPC-BoldItalic CordiaUPC-Italic CordiaUPC-Light EucrosiaUPC-Bold EucrosiaUPC-BoldItalic EucrosiaUPC-
       Italic EucrosiaUPC-Light FreesiaUPC-Bold FreesiaUPC-BoldItalic FreesiaUPC-Italic FreesiaUPC-Light IrisUPC-Bold IrisUPC-BoldItalic  IrisUPC-
       Italic  IrisUPC-Light  JasmineUPC-Bold  JasmineUPC-BoldItalic  JasmineUPC-Italic JasmineUPC-Light KodchiangUPC-Bold KodchiangUPC-BoldItalic
       KodchiangUPC-Italic  KodchiangUPC-Light	LilyUPC-Bold  LilyUPC-BoldItalic  LilyUPC-Italic  LilyUPC-Light  WaterlilyUPC-Bold   WaterlilyUPC-
       BoldItalic WaterlilyUPC-Italic WaterlilyUPC-Light YuccaUPC-Bold YuccaUPC-BoldItalic YuccaUPC-Italic YuccaUPC-Light

       For general information on printing Asian language text, refer to i18n_printing(5).

   Codeset Conversion
       The  following  converter pairs are available for converting data between TACTIS and other encoding formats. Refer to iconv_intro(5) for an
       introduction to codeset conversion. For more information about the other codeset for which TACTIS is the input or output, see the reference
       page specified in the list item.  cp874_TACTIS, TACTIS_cp874

	      Converting from and to PC code page 874: code_page(5) UCS-2_TACTIS, TACTIS_UCS-2

	      Converting from and to UCS-2: Unicode(5) UCS-4_TACTIS, TACTIS_UCS-4

	      Converting from and to UCS-4: Unicode(5) UTF-8_TACTIS, TACTIS_UTF-8

	      Converting from and to UTF-8: Unicode(5)

SEE ALSO

       Commands: locale(1)

       Others: code_page(5), ascii(5), i18n_intro(5), i18n_printing(5), iconv_intro(5), Thai(5), Unicode(5), Wototo(5)

																	 TACTIS(5)
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