'isprint func'에 해당되는 글 1건

  1. 2021.07.05 Watcom C Library : isatty, iscntrl, isdigit, isgraph, islower, isprint

 

 

Watcom C Library Reference : isatty, iscntrl, isdigit, isgraph, islower, isprint

 

 

 

 

isatty

 

Synopsis : #include <io.h> 

              int isatty( int handle );

 


Description : The isatty function tests if the opened file or device referenced by the file handle handle is a character device (for example, a console, printer or port).

 

 

Returns : The isatty function returns zero if the device or file is not a character device, otherwise, a non-zero value is returned. When an error has occurred, errno contains a value indicating the type of error that has been detected.

 

 

See Also : open

 


Example :

#include <stdio.h> 

#include <io.h>


void main( )

{
    printf( "stdin is a %stty\n", (isatty (fileno ( stdin ) ) ) ? "" : "not " );

}

 

Classification : POSIX 1003.1
Systems : All

 

 

 

 

 

iscntrl

 

Synopsis : #include <ctype.h> 

              int iscntrl( int c );

 


Description : The iscntrl function tests for any control character. A control character is any character whose value is from 0 through 31.

 

 

Returns : The iscntrl returns a non-zero value when the argument is a control character; otherwise, zero is returned.

 

 

See Also : isalnum, isalpha, isdigit, isgraph, islower, isprint, ispunct, isspace, isupper, isxdigit, tolower, toupper

 


Example :

#include <stdio.h> 

#include <ctype.h>


char chars[ ] = {
    'A',

    0x09,

    'Z'

};


#define SIZE sizeof( chars ) / sizeof( char )


void main( )

{
    int     i;


    for( i = 0; i < SIZE; i++ ) {

        printf( "Char %c is %s a Control character\n",
                   chars[i], ( iscntrl ( chars[i] ) ) ?"" : "not " );

    }

}

 


produces the following :
Char A is not  a Control character 

Char     is  a Control character

Char Z is not  a Control character

 

Classification : ANSI
Systems : All

 

 

 

 

 

isdigit

 

Synopsis : #include <ctype.h> 

              int isdigit( int c );

 


Description : The isdigit function tests for any decimal-digit character '0' through '9'.

 

 

Returns : The isdigit function returns a non-zero value when the argument is a digit; otherwise, zero is returned.

 

 

See Also : isalnum, isalpha, iscntrl, isgraph, islower, isprint, ispunct, isspace, isupper, isxdigit, tolower, toupper

 


Example :

#include <stdio.h> 

#include <ctype.h>


char chars[ ] = {
    'A',

    '5',
    '$'

};


#define SIZE sizeof( chars ) / sizeof( char )


void main( )

{
    int     i;


    for( i = 0; i < SIZE; i++ ) {

        printf( "Char %c is %s a digit character\n",
                   chars[i], ( isdigit( chars[i] ) ) ? "" : "not " );

    }

}

 


produces the following :
Char A is not  a digit character

Char 5 is  a digit character

Char $ is not  a digit character

 

Classification : ANSI
Systems : All

 

 

 

 

 

isgraph

 

Synopsis : #include <ctype.h> 

              int isgraph( int c );

 


Description : The isgraph function tests for any printable character except space (' '). The isprint function is similar, except that the space character is also included in the character set being tested.

 

 

Returns : The isgraph function returns non-zero when the argument is a printable character (except a space); otherwise, zero is returned.

 

 

See Also : isalnum, isalpha, iscntrl, isdigit, islower, isprint, ispunct, isspace, isupper, isxdigit, tolower, toupper

 


Example :

#include <stdio.h> 

#include <ctype.h>


char chars[ ] = {
    'A',

    0x09,

    ' ',
    0x7d

};


#define SIZE sizeof( chars ) / sizeof( char )


void main( )

{
    int     i;


    for( i = 0; i < SIZE; i++ ) {

        printf("Char %c is %s a printable character\n",
                  chars[i], ( isgraph ( chars[i] ) ) ? "" : "not " );

    }

}

 


produces the following :
Char A is  a printable character 

Char     is not  a printable character

Char   is not  a printable character

Char } is  a printable character

 

Classification : ANSI
Systems : All

 

 

 

 

 

islower

 

Synopsis : #include <ctype.h> 

              int islower( int c );

 


Description : The islower function tests for any lowercase letter 'a' through 'z'.

 

 

Returns : The islower function returns a non-zero value when argument is a lowercase letter; otherwise, zero is returned.

 

 

See Also : isalnum, isalpha, iscntrl, isdigit, isgraph, isprint, ispunct, isspace, isupper, isxdigit, tolower, toupper

 


Example :

#include <stdio.h> 

#include <ctype.h>


char chars[ ] = {
    'A',

    'a',
    'z',
    'Z'
};


#define SIZE sizeof( chars ) / sizeof( char )


void main( )

{
    int    i;


    for ( i = 0; i < SIZE; i++ ) {

        printf( "Char %c is %s a lowercase character\n",
                   chars[i], ( islower( chars [i] ) ) ? "" : "not " );

    }

}

 


produces the following :
Char A is not  a lowercase character 

Char a is  a lowercase character 

Char z is  a lowercase character 

Char Z is not  a lowercase character

 

Classification : ANSI
Systems : All

 

 

 

 

 

 

isprint

 

Synopsis : #include <ctype.h> 

              int isprint( int c );

 


Description : The isprint function tests for any printable character including space (' '). The isgraph function is similar, except that the space character is excluded from the character set being tested.

 

 

Returns : The isprint function returns a non-zero value when the argument is a printable character; otherwise, zero is returned.

 

 

See Also : isalnum, isalpha, iscntrl, isdigit, isgraph, islower, ispunct, isspace, isupper, isxdigit, tolower, toupper

 


Example :

#include <stdio.h> 

#include <ctype.h>


char chars [ ] = {
    'A',
    0x09,

    ' ',
    0x7d

};


#define SIZE sizeof( chars ) / sizeof( char )


void main( )

{
    int     i;


    for ( i = 0; i < SIZE; i++ ) {

        printf("Char %c is %s a printable character\n",
                  chars(i), ( isprint ( chars(i) ) ) ? "" : "not " );

    }

}

 


produces the following :

Char A is  a printable character 

Char     is not  a printable character 

Char  is  a printable character 

Char } is a printable character

 

Classification : ANSI
Systems : All

 

 

 

 

 

 

 

 

This manual describes the WATCOM C library for DOS, Windows, and OS/2, It includes the Standard C Library (as defined in the ANSI C Standard).

 

WATCOM C Language Reference manual describes the ANSI C Programming language and extensions to it which are supported by WATCOM C/C++ (32bit)

 

 

 

 

 

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