isascii

raw OCR

Character classification macro.

Defined in header <ctype.h>

Syntax

#include <ctype.h>
int isascii(int c);

Portability

DOS	UNIX	Windows	ANSI C	C++ only
■	■	■

Remarks

isascii is a macro that classifies ASCII-coded integer values by table lookup. It is a predicate returning nonzero for true and 0 for false.

isascii is defined on all integer values.

Return value

isascii returns nonzero if the low order byte of c is in the range 0 to 127 (0x00-0x7F).

Example

#include <ctype.h>
#include <stdio.h>
int main (void)
{
   char c =  'C ;
   if  (isascii(c))
      printf("%c  is ascii\n",c);
   else
      printf("%c  isn't ascii\n",c);

   return 0;

Differences from modern implementations

Nothing recorded yet.

Modern references

POSIX (search)
Microsoft C runtime (search)

These are search links, not yet checked by hand.

Stable link: /3.1/ctype.h/isascii/ · short form /3.1/isascii/