C++ Primer学习笔记——basis

1、IDE：integrated development environment

2、initialized variable: those that are given a value when theyare defined

   uninitialized variable:those that are not given an initial value

3、end-of-file: Windows: ctrl+z

                          Unix & Mac OS-X: ctrl+d

4、Headers for the standard library are enclosed in anglebrackets(< >).

   Nonstandard headers areenclosed in double quotes(" ").

5、wchar_t: this type is used for extended character sets, suchas those used for Chinese and Japanese, in which some characterscannot be represented within a single "char".

6、We usually refer to a chunk of 8 bits as a "byte" and 32 bits,or 4 bytes, as a "word".

7、An 8-bit integral signed type represented using a sign-bit canhold values from -128 t0 127.

8、Float is guaranteed to offer only 6 significant digits, andthe double type guarantees at least 10 significant digits.

9、