Syntax
#include <ctype.h> int _iscsym(int c); int _iscsymf(int c);
These macros test if an integer is within a particular ASCII set. The macros assume that the system uses the ASCII character set.
_iscsym tests if a character is alphabetic, a digit, or an underscore (_). _iscsymf tests if a character is alphabetic or an underscore. Returns
This example uses _iscsym and _iscsymf to test the characters a, _, and 1. If the character falls within the ASCII set tested for, the macro returns TRUE. Otherwise, it returns FALSE.
#include <stdio.h>
#include <ctype.h>
int main(void)
{
int ch[3] = { 'a','_','1' };
int i;
for (i = 0; i < 3; i++) {
printf("_iscsym('%c') returns %s\n", ch[i], _iscsym(ch[i])?"TRUE":"FALSE");
printf("_iscsymf('%c') returns %s\n\n", ch[i], _iscsymf(ch[i])?"TRUE":
"FALSE");
}
return 0;
/****************************************************************************
The output should be:
_iscsym('a') returns TRUE
_iscsymf('a') returns TRUE
_iscsym('_') returns TRUE
_iscsymf('_') returns TRUE
iscsym('1') returns TRUE
iscsymf('1') returns FALSE
****************************************************************************/
}
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