还可以使用指数表示浮点数，参见清单8。
Floats can also be expressed using exponents, as shown Listing 8.
指数函数是一个很好的例子，它表明处理有限精度浮点数(而不是无限精度实数)时是需要非常小心的。
The exponential function serves as a good example of how careful you have to be when dealing with limited-precision floating-point Numbers instead of infinitely precise real numbers. ex (Math.exp ).
longdouble IEEE双字节扩展浮点数15位指数，64位带符号小数。
Long double IEEE double extended floating point exponent of 15 bits and signed fraction of 64 bits.
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