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16-Bit Language Tools Libraries
2.4
<CTYPE.H> CHARACTER HANDLING
The header file ctype.h consists of functions that are useful for classifying and
mapping characters. Characters are interpreted according to the Standard C locale.
isalnum
Description:
Include:
Prototype:
Test for an alphanumeric character.
<ctype.h>
int isalnum(int c );
Argument:
c
The character to test.
Return Value:
Remarks:
Example:
Returns a non-zero integer value if the character is alphanumeric;
otherwise, returns a zero.
Alphanumeric characters are included within the ranges A-Z, a-z or 0-9.
#include <ctype.h> /* for isalnum */
#include <stdio.h> /* for printf */
int main(void)
{
int ch;
ch = '3';
if (isalnum(ch))
printf("3 is an alphanumeric\n");
else
printf("3 is NOT an alphanumeric\n");
ch = '#';
if (isalnum(ch))
printf("# is an alphanumeric\n");
else
printf("# is NOT an alphanumeric\n");
}
Output:
3 is an alphanumeric
# is NOT an alphanumeric
isalpha
Description:
Include:
Prototype:
Test for an alphabetic character.
<ctype.h>
int isalpha(int c );
Argument:
c
The character to test.
DS51456E-page 14
Return Value:
Remarks:
Returns a non-zero integer value if the character is alphabetic;
otherwise, returns zero.
Alphabetic characters are included within the ranges A-Z or a-z.
? 2008 Microchip Technology Inc.
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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