本文为《 Beginning C++17》第一章的学习笔记，涵盖了块的嵌套、main()函数的特殊性、标准库的命名空间、作用域解析运算符、数值表示法以及Unicode字符类型等内容。
书名：Beginning C++17 - From Novice to Professional
作者：Ivor Horton, Peter Van Weert
笔记：
Blocks can be placed inside other blocks—this concept is called nesting. Blocks can be nested, one within another, to any depth.
main() is the only function for which omitting return is equivalent to returning zero. Any other function with return type int always has to end with an explicit return statement—the compiler shall never presume to know which value an arbitrary function should return by default.
The
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