── FIRSTWORD ── ( ──<arithmetic expression>─┬──────────────────────┬───►
                                            └─ , ──<real variable>─┘
►─ ) ──────────────────────────────────────────────────────────────────┤

The FIRSTWORD function returns, as a real value, the first word of the double-precision arithmetic expression. The arithmetic expression is first extended to double-precision, if necessary. If the real variable parameter is specified, the second word of the double-precision arithmetic expression is stored in the variable.