sheilong

#include <ctype.h>

int getop(char *s)
{
        if (!isdigit(*s) && (*s != '.' && *s != '-'))
                return *s;       /* not a number */
        if (*s == '-')
                if (*s++ == '\0')
                        return '-';
        if (isdigit(*s)) /* collect integer part */
                while (isdigit(*s)) {
                        printf("%c", *s);
                        *s++;
                }
        if (*s == '.') {   /* collect fractional part */
                *s++;
                while (isdigit(*s)) {
                        printf("%c", *s);
                        *s++;
                }
        }
        return NUMBER;
}