int isalpha ( int c ); |
<cctype> |
Check if character is alphabetic
Checks if parameter c is either an uppercase or a lowercase alphabetic letter.
Notice that what is considered a letter may depend on the locale being used; In the default C locale, what constitutes a letter is what returns true by either isupper or islower.
For a detailed chart on what the different ctype functions return for each character of the standard ANSII character set, see the reference for the <cctype> header.
Parameters
- c
- Character to be checked, casted to an int, or EOF.
Return Value
A value different from zero (i.e.,
true) if indeed
c is an alphabetic letter. Zero (i.e.,
false) otherwise.
Example
/* isalpha example */
#include <stdio.h>
#include <ctype.h>
int main ()
{
int i=0;
char str[]="C++";
while (str[i])
{
if (isalpha(str[i])) printf ("character %c is alphabetic\n",str[i]);
else printf ("character %c is not alphabetic\n",str[i]);
i++;
}
return 0;
}
|
Output:
character C is alphabetic
character + is not alphabetic
character + is not alphabetic
|
See also
| isalnum | Check if character is alphanumeric (function) |
| isdigit | Check if character is decimal digit (function) |
