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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 302997643 by yifangt on Wednesday 17th of May 2017 04:14:52 PM
Old 05-17-2017
I think I can get the logic part, but not the 'ee' from Test to Teest'.
I re-wrote the code to avoid any possible confusion just simply printing each char twice:
Code:
#include <stdio.h>
#include <stdlib.h>

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

int putcharTwice(int c)
{
    if (putchar(c) == EOF || putchar(c) == EOF)  {
    return EOF;
    } else {
    putchar(c);  //explicit printing
    putchar(c);  //explicit printing
    return 0;
    }
}

int main(int argc, char **argv)
{
    int c;

    while ((c = getchar()) != EOF) {
    putcharTwice(c); 
     }
    return 0;
}

but the code actually print each char FOUR times!
Code:
$ echo Test | ./a.out
TTTTeeeesssstttt.

Apparently every last two repeats are from the explicit printing. Where are the first two repeats from?
Sorry for my slow catch!
Last edited by yifangt; 05-17-2017 at 05:27 PM..
 

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LEARN ABOUT CENTOS

tacchtype

thai/wtt.h(3)							      libthai							     thai/wtt.h(3)

NAME

       thai/wtt.h -

       WTT I/O implementation.

SYNOPSIS

   Enumerations
       enum WTTClass { CTRL = 0, NON = 1, CONS = 2, LV = 3, FV1 = 4, FV2 = 5, FV3 = 6, BV1 = 7, BV2 = 8, BD = 9, TONE = 10, AD1 = 11, AD2 = 12,
	   AD3 = 13, AV1 = 14, AV2 = 15, AV3 = 16 }
	   Classification of characters in TIS620 according to WTT.
       enum WTTOp { CP = 1, XC = 2, AC = 3, RJ = 4, SR = 5 }
	   Composibility checking tables.

   Functions
       WTTClass TACchtype (thchar_t c)
	   WTT character class.
       WTTOp TACio_op (thchar_t c1, thchar_t c2)
	   WTT I/O operation.

Detailed Description
       WTT I/O implementation.

       WTT stands for Wing Tuk Tee (in Thai, Runs everywhere). It was defined by TACTIS (Thai API Consortium/Thai Industrial Standard) in the
       NECTEC Thai Software Standard Project (1989-1991), and later endorsed by Thai Industrial Standard Institute (TISI) as TIS 1566-2541 in
       1998.

       WTT classifies Thai chracter(TIS-620) into 17 types below.

       ITYPE  VALUE SHORT_DESCRIPTION
       CTRL    0    control characters
       NON     1    non composible characters
       CONS    2    consonants
       LV      3    leading vowels
       FV1     4    following vowels 1
       FV2     5    following vowels 2
       FV3     6    following vowels 3
       BV1     7    below vowels 1
       BV2     8    below vowels 2
       BD      9    below diacritics
       TONE    10   tonemarks
       AD1     11   above diacritics 1
       AD2     12   above diacritics 2
       AD3     13   above diacritics 3
       AV1     14   above vowels 1
       AV2     15   above vowels 2
       AV3     16   above vowels 3

       Functions in thctype.h do basic character classifications while wtt.h classifies a chracter in detail. Please refer to the reference.

       TACio_op() checks how to compose two given chracters. The possiblities are Composible (CP), Non-display (XC), Accept (AC), Reject (RJ) and
       Strict Reject (SR). The values of CP, XC, AC, RJ and SR are difined in wtt.h. And their meanings are:

       o CP : second character is displayed in the same cell as the first, also implies an acceptance.
       o XC : Do nothing.
       o AC : Display second character in the next cell.
       o RJ : Discard second character.
       o SR : Reject second character only in strict mode.
Enumeration Type Documentation
   enum WTTClass
       Classification of characters in TIS620 according to WTT.
       Enumerator
       CTRL   control chars
       NON    non composibles
       CONS   consonants
       LV     leading vowels
       FV1    following vowels 1
       FV2    following vowels 2
       FV3    following vowels 3
       BV1    below vowels 1
       BV2    below vowels 2
       BD     below diacritics
       TONE   tonemarks
       AD1    above diacritics 1
       AD2    above diacritics 2
       AD3    above diacritics 3
       AV1    above vowels 1
       AV2    above vowels 2
       AV3    above vowels 3
   enum WTTOp
       Composibility checking tables.
       Enumerator
       CP     COMPOSIBLE - following char is displayed in the same cell as leading char, also implies ACCEPT
       XC     Non-display
       AC     ACCEPT - display the following char in the next cell
       RJ     REJECT - discard that following char, ignore it
       SR     STRICT REJECT - REJECT only if in strict mode
Function Documentation
   WTTClass TACchtype (thchar_tc)
       WTT character class.
       Parameters:
	   c : the character
       Returns:
	   WTT character class { CTRL, ..., AV3 }
   WTTOp TACio_op (thchar_tc1, thchar_tc2)
       WTT I/O operation.
       Parameters:
	   c1 : previous character
	   c2 : next character
       Returns:
	   WTT I/O operation { CP, XC, AC, RJ, SR }
Author
       Generated automatically by Doxygen for libthai from the source code.

Version 0.1.14							  Tue Jun 17 2014						     thai/wtt.h(3)
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