<arithmetic_function>::=
ABS (<expression>)
| CEIL (<expression>)
| EXP (<expression>)
| FIXED (<expression>[,<unsigned_integer>[,<unsigend_integer>]])
| FLOAT (<expression>,<unsigend_integer>)
| FLOOR (<expression>)
| INDEX (<string_spec>,<string_spec>[,<expression>[,<expression>]])
| LENGTH (<expression>)
| LN (<expression>)
| LOG (<expression>)
| NOROUND (<expression>)
| PI
| POWER (<expression>,<expression>)
| ROUND (<expression>[,<expression>])
| SIGN (<expression>)
| SQRT (<expression>)
| TRUNC (<expression>[,<expression>])
