如何将指数形式的浮点值转换成点表示法?[复制]

你可以使用 fixed I/O操纵器强制以定点表示法打印数字:

double d = 42.0;
std::cout << std::fixed << d;

( std::scientific 相反:它强制数字以科学记数法打印)

some support was added in 10g ).

select to_number('1e-1') num, 
       to_char(to_number('1e-1'),'9.9EEEE') sci_num, 
       to_char(to_number('1e-1')) std_num 
from dual;

            NUM SCI_NUM   ST
--------------- --------- --
            .10   1.0E-01 .1