/*
 * edlib v1.1 Copyright 1989 Edwin Hoogerbeets
 * This code is freely redistributable as long as no charge other than
 * reasonable copying fees are levied for it.
 */

/*
    tests whether the given character could be a binary digit
*/
#include <stdio.h>

int isbdigit(c)
register char c;
{
    if ( c == '1' || c == '0' ) {
        return(1);
    } else {
        return(NULL);
    }
}