Watcom C Library : ispunct, isspace, isupper, isxdigit, itoa

 

 

Watcom C Library Reference : ispunct, isspace, isupper, isxdigit, itoa

 

 

 

 

ispunct

 

Synopsis : #include <ctype.h> 

              int ispunct( int c );

 

Description : The ispunct function tests for any punctuation character such as a comma (,) or a period (.)

 

 

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

 

 

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

 

Example :

#include <stdio.h> 

#include <ctype.h>

char chars [ ] = {
    'A',

    '!',

    '.',

    ',',

    ':',

    ';'

};

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

void main( )

{
    int     i;

    for( i = 0; i < SIZE; i++ ) {

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

    }

}

 

produces the following :
Char A is not  a punctuation character 

Char ! is  a punctuation character 

Char , is  a punctuation character 

Char , is  a punctuation character 

Char : is  a punctuati on character 

Char ; is  a punctuation character

 

Classification : ANSI
Systems : All

 

 

 

 

 

isspace

 

Synopsis : #include <ctype.h> 

              int isspace( int c );

 

Description : The isspace function tests for the following white-space characters:

 

Constant	Character
' '	space
'\f'	form feed
'\n'	new-line or linefeed
'\r'	carriage return
'\t'	horizontal tab
'\v'	vertical tab

 

 

Returns : The isspace function returns a non-zero character when the argument is one of the indicated white-space characters; otherwise, zero is returned.

 

 

See Also : isalnum, isalpha, iscntrl, isdigit, isgraph, islower, isprint, ispunct, 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 space character\n",
                   chars(i), ( isspace ( chars[i] ) ) ? "" : "not" );

    }

}

 

produces the following :
Char A is not  a space character 

Char     is  a space character 

Char  is  a space character 

Char } is not  a space character

 

Classification : ANSI
Systems : All

 

 

 

 

 

isupper

 

Synopsis : #include <ctype.h> 

              int isupper( int c );

 

Description : The isupper function tests for any uppercase letter 'A' through 'Z'.

 

 

Returns : The isupper returns a non-zero value when the argument is an uppercase letter; otherwise, zero is returned.

 

 

See Also : isalnum, isalpha, iscntrl, isdigit, isgraph, islower, isprint, ispunct, isspace, 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 an uppercase character\n",
                   chars[i], ( isupper( chars[i] ) ) ?" : "not " );

    }

}

 

produces the following :
Char A is  an uppercase character 

Char a is not  an uppercase character 

Char z is not  an uppercase character 

Char Z is  an uppercase character

 

Classification : ANSI
Systems : All

 

 

 

 

 

isxdigit

 

Synopsis : #include <ctype.h> 

              int isxdigit( int c );

 

Description : The isxdigit function tests for any hexadecimal-digit character. These characters are the digits ('0' through '9') and the letters ('a' through 'f') and ('A' through 'F').

 

 

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

 

 

See Also : isalnum, isalpha, iscntrl, isdigit, isgraph, islower, isprint, ispunct, isspace, isupper, 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 hexadecimal digit character\n", 

                   chars[i], ( isxdigit( chars[i] ) ) ? "" : "not " );

    }

}

 

 

produces the following :
Char A is  a hexadecimal digit character 

Char 5 is  a hexadecimal digit character 

Char $ is not  a hexadecimal digit character

 

Classification : ANSI
Systems : All

 

 

 

 

 

itoa

 

Synopsis : #include <stdlib.h> 

              char *itoa( int value, char *buffer, int radix );

 

Description : The itoa function converts the binary integer value into the equivalent string in base radix notation storing the result in the character array pointed to by buffer. A null character is appended to the result. The size of buffer must be at least (8 * sizeof(int) + 1) bytes when converting values in base 2. That makes the size 17 bytes on 16-bit machines, and 33 bytes on 32-bit machines. If the value of radix is 10 and value is negative, then a minus sign is prepended to the result.

 

 

Returns : The itoa function returns the pointer to the result.

 

 

See Also : atoi, strtol, utoa

 

Example :

#include <stdio.h>

 #include <stdlib.h>

void main( )
{
    char   buffer [20];

    int     base;

    for( base = 2; base <= 16; base = base + 2 ) {

        printf( "%2d  %s\n", base, itoa( 12765, buffer, base ) );

    }

}

 

produces the following :
2  11000111011101 

4  3013131 

6  135033 

8  30735 

10  12765 

12  7479 

14  491b 

16  31dd

 

Classification : WATCOM
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)