本文详细阐述了C++编程中的核心概念，包括函数声明与定义的区别、包含文件的两种引用方式、运算符符号意义、标准C++库的封装、main()函数的返回类型以及C++的自由形式特性。
1、In the function declaration,the argument identifiers are optional. In the definitions,they are required.
2、A #include may name a file in two ways:in angle brackets(<>) or in double quotes.
3、The operator << means "send to".
4、All of the Standard C++ libraries are wrapped in a single namespace, which is std(for "standard").
5、In C++,main() always has return type of int.
6、C and C++ are free form languages. The compiler ignores newlines and white spaces,so statements are delimited by semicolons.
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