1、floating point exception

floating point exception发音

英：　　美：

floating point exception中文意思翻译

常用释义：浮点异常：在计算机编程中

浮点数异常错误

floating point exception双语使用场景

1、Floating-point operations never throw an exception.───浮点运算永远不会引发异常。

2、SIGFPE - Arithmetic exception, integer divided by 0, or floating-point exception.───SIGFPE—算术异常、整数被零除或浮点异常。

3、Information technology - Programming languages - Fortran - Floating-point exception handling───信息技术.程序设计语音.Fortran语言.浮点排除处理

floating point exception相似词语短语

1、floating point overflow───浮点溢出

2、invalid floating point operation───浮点运算无效

3、exception───n.例外；异议

4、floating point───浮点，浮点法，浮点小数点；[计]浮点

5、floating───v.漂浮（float的现在分词）；adj.流动的；漂浮的，浮动的

6、floating shelves───浮动货架

7、exception eaccessviolation───例外情况

8、floating restaurants───浮动餐厅

9、floating point division by zero───浮点除零

2、c语言打印double类型？

相信很多人学C语言时, 对long double的印象就是, 它能存储精度比double更高的浮点数.

但事实上并不完全是这样.

C98的标准是: double类型的值是long double的子集

C++ 98 standard：

and the type long double provides at least as much precision as double. The set of values of the type float is a subset of the set of values of the type double; the set of values of the type double is a subset of the set of values of the type long double.

也就是說，long double只是定義為至少跟double一樣精度（即是可以一樣）

在wiki上的long double上找到：

On the x86 architecture, most C compilers implement long double

as the 80-bit extended precision type supported by x86 hardware (sometimes stored as 12 or 16 bytes to maintain data structure alignment), as specified in the C99 / C11 standards (IEC 60559 floating-point arithmetic (Annex F)).

An exception is Microsoft Visual C++ for x86, which makes long double

a synonym for double

.

在MSDN上, 可以发现:

Previous 16-bit versions of Microsoft C/C++ and Microsoft Visual C++ supported the long double, 80-bit precision data type. In Win32 programming, however, the long double data type maps to the double, 64-bit precision data type. The Microsoft run-time library provides long double versions of the math functions only for backward compatibility. The long double function prototypes are identical to the prototypes for their double counterparts, except that thelongdouble data type replaces the double data type. The long doubleversions of these functions should not be used in new code.

早期windows 16位是支持long double类型(80位), 可是在Win32编程中, double跟long double等价了, 都是64位了. 尽管数学函数如sin, cos等仍然保留long double类型,可是这些仅仅用来保持向后兼容(windows为了向后兼容付出了很多的..还有dll地狱一说)

也就是说, 在32位中, long double 跟 double等价, 精度也是一样的.

我在自己机器上测试,

cout