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 that uses isascii()
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
************************************************/
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