numeric_function:
          abs(arith_expr)
     |    acos(arith_expr)
     |    asin(arith_expr)
     |    atan(arith_expr)
     |    atan2(arith_expr1, arith_expr2)
     |    {ceil | ceiling}(arith_expr)
     |    cos(arith_expr)
     |    cot(arith_expr)
     |    degrees(arith_expr)
     |    exp(arith_expr)
     |    floor(arith_expr)
     |    {ln | log}(arith_expr)
     |    mod(arith_expr1, arith_expr2)
     |    pi()
     |    power(arith_expr1, arith_expr2)
     |    rand(num)
     |    round(arith_expr)
     |    sign(arith_expr)
     |    sin(arith_expr)
     |    sqrt(arith_expr)
     |    tan(arith_expr)