isascii() — Test for Character Representable as ASCII Value
Format
#include <ctype.h>
int isascii(int c);Language Level
XPG4
Threadsafe
Yes
Locale Sensitive
The behavior of this function might be affected by the LC_CTYPE category of the current locale. This function is not available when LOCALETYPE(*CLD) is specified on the compilation command. For more information, see Understanding CCSIDs and Locales.
Description
The isascii() function
tests if a given character, in the current locale, can be represented
as a valid 7–bit US-ASCII character.
Return Value
The isascii() function
returns nonzero if c, in the current locale,
can be represented as a character in the 7–bit US-ASCII character
set. Otherwise, it returns 0.
Example
This example tests the integers
from 0x7c to 0x82, and prints the corresponding character if the integer
can be represented as a character in the 7–bit US-ASCII character
set.
#include <stdio.h>
#include <ctype.h>
int main(void)
{
int ch;
for (ch = 0x7c; ch <= 0x82; ch++) {
printf("%#04x ", ch);
if (isascii(ch))
printf("The character is %c\n", ch);
else
printf("Cannot be represented by an ASCII character\n");
}
return 0;
}
/************************************************
The output should be:
0x7c The character is @
0x7d The character is '
0x7e The character is =
0x7f The character is "
0x80 Cannot be represented by an ASCII character
0x81 The character is a
0x82 The character is b
************************************************/