在C / C声明指针变量的正确方法+ [英] Correct way of declaring pointer variables in C/C++

问题描述

我注意到一些人使用下面的符号来声明指针变量。

I noticed some people use the following notation for declaring pointer variables.

(a) char* p;

而不是

(b) char *p;

我用（B）。什么是符号（一）背后的理性？
符号（B）更有意义，我是因为字符指针不是一个类型本身。代替的类型是字符，变量可以是指向字符

I use (b). What is the rational behind the notation (a)? Notation (b) makes more sense to me because character pointer is not a type itself. Instead the type is character and the variable may be a pointer to the character.

char* c;

这貌似有一个char *类型和变量c是该类型的。但实际上类型为char和* C（c所指向的内存位置）是类型（炭）的。如果您一次这种区别就显而易见声明多个变量。

This looks like there is a type char* and the variable c is of that type. But in fact the type is char and *c (the memory location pointed by c) is of that type (char). If you declare multiple variables at once this distinction becomes obvious.

char* c, *d;

这看起来很奇怪。无论c和d同一种指向一个字符指针。在此，因为下一个看起来更自然。

This looks weird. Both c and d are same kind of pointers that point to a character. In this since the next one looks more natural.

char *c, *d;

感谢。

推荐答案

Bjarne的Stroustrup的说：

Bjarne Stroustrup said:

之间的选择诠释* P;和INT * P;是不是对与错，而是风格和强调。 ç强调前pressions;声明常常被认为比必要之恶而已。 C ++另一方面，具有重强调类型

The choice between "int* p;" and "int *p;" is not about right and wrong, but about style and emphasis. C emphasized expressions; declarations were often considered little more than a necessary evil. C++, on the other hand, has a heavy emphasis on types.

一个典型的C程序员写道：诠释* P;并解释为* p是什么是诠释强调语法，以及可能指向C（和C ++）声明语法主张风格的正确性。事实上，*结合在语法名称第

A "typical C programmer" writes "int *p;" and explains it "*p is what is the int" emphasizing syntax, and may point to the C (and C++) declaration grammar to argue for the correctness of the style. Indeed, the * binds to the name p in the grammar.

一个典型的C ++程序员写道：诠释* P;并解释为p是一个指向一个int强调类型。的确p的类型是int *。我清楚地preFER的重视，并看到它使用C ++更先进的部分以及重要的。

A "typical C++ programmer" writes "int* p;" and explains it "p is a pointer to an int" emphasizing type. Indeed the type of p is int*. I clearly prefer that emphasis and see it as important for using the more advanced parts of C++ well.

来源：<一个href=\"http://www.stroustrup.com/bs_faq2.html#whitespace\">http://www.stroustrup.com/bs_faq2.html#whitespace

我建议后者风格，因为在你的声明在一行（你的第4个例子）多个指针，具有可变星号将是你习惯了什么情况。

I'd recommend the latter style because in the situation where you are declaring multiple pointers in a single line (your 4th example), having the asterisk with the variable will be what you're used to.

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