The not_eq macro, which is part of <iso646.h>, is a convenient object-like macro name that expands to the != operator. The macro was added in Normative Addendum 1 in an effort to provide support for international character sets that might not have the ! symbols.

Synopsis

#include <iso646.h>
#define not_eq !=

Description

The not_eq object-like macro expands to the != operator.

Example

#include <iso646.h>

int main ()
{
    if ((2 not_eq 1) and (1 not_eq 2))
        return 1;
    return 0;
}