书名：Modern C++：Efficient and Scalable Application Development
作者名：Richard Grimes Marius Bancila
本章字数：263字
更新时间：2021-06-10 18:27:50

Using whitespace

Other than string literals, you have free usage of white space (spaces, tabs, newlines), and are able to use as much or as little as you like. C++ statements are delimited by semicolons, so in the following code there are three statements, which will compile and run:

    int i = 4; 
    i = i / 2; 
    std::cout << "The result is" << i << std::endl;

The entire code could be written as follows:

    int i=4;i=i/2; std::cout<<"The result is "<<i<<std::endl;

There are some cases where whitespace is needed (for example, when declaring a variable you must have white space between the type and the variable name), but the convention is to be as judicious as possible to make the code readable. And while it is perfectly correct, language-wise, to put all the statements on one line (like JavaScript), it makes the code almost completely unreadable.

If you are interested in some of the more creative ways of making code unreadable, have a look at the entries for the annual International Obfuscated C Code Contest ( http://www.ioccc.org/). As the progenitor of C++, many of the lessons in C shown at IOCCC apply to C++ code too.

Bear in mind that, if the code you write is viable, it may be in use for decades, which means you may have to come back to the code years after you have written it, and it means that other people will support your code, too. Making your code readable is not only a courtesy to other developers, but unreadable code is always a likely target for replacement.