指针的大小 [英] size of pointers

问题描述

我一直在想所有指针（对任何一个obejct）都有相同的

大小。指针的大小是int的大小。这是因为一个int解决了一个内存位置。这是对还是错？

解决方案

" subramanian" < su ************** @ yahoo.comwrote：

我一直在想所有的指针（对任何一个obejct）有相同的

大小。指针的大小是int的大小。这是因为一个int解决了一个内存位置。这是对还是错？

完全错误，在所有三个方面。


Richard

< blockquote>机器字是32位


sizeof（char）== 1

sizeof（int）== 4

sizeof（ char *）== 4

sizeof（int *）== 4

char array [30] =" abc"

char * p =数组;


sizeof（数组）== 30

sizeof（p）== 4

strlen（array）== strlen（p）

strlen（array）== 3
$ b $bóú星期一，2006年12月18日23:32:41 -0800£subramanianD' μ？£o

我一直在想所有指针（对任何一个obejct）都有相同的

大小。指针的大小是int的大小。这是因为一个int解决了一个内存位置。这是对还是错？

subramanian写道：

我一直在想所有指针（对任何一个obejct）有相同的

大小。指针的大小是int的大小。这是因为一个int解决了一个内存位置。这是对还是错？

你错了。指向不同种类物体的指针可能会有不同的尺寸;那个大小不一定是int;内存位置是由指向对象而不是由int指定的
。

I have been thinking that all pointers(to any obejct) have the same
size. The size of a pointer is the size of an int. This is beause a
memory location is addressed by an int. Is that right/wrong?

解决方案

"subramanian" <su**************@yahoo.comwrote:

I have been thinking that all pointers(to any obejct) have the same
size. The size of a pointer is the size of an int. This is beause a
memory location is addressed by an int. Is that right/wrong?

Entirely wrong, on all three counts.

Richard

machine word is 32bit

sizeof(char) == 1
sizeof(int) == 4
sizeof(char *) == 4
sizeof(int *) == 4

char array[30]= "abc"
char *p=array;

sizeof(array) == 30
sizeof(p) == 4
strlen(array) == strlen(p)
strlen(array) == 3
óú Mon, 18 Dec 2006 23:32:41 -0800￡?subramanianD′μ?￡o

I have been thinking that all pointers(to any obejct) have the same
size. The size of a pointer is the size of an int. This is beause a
memory location is addressed by an int. Is that right/wrong?

subramanian wrote:

I have been thinking that all pointers(to any obejct) have the same
size. The size of a pointer is the size of an int. This is beause a
memory location is addressed by an int. Is that right/wrong?

You are wrong on all counts. Pointers to different kinds of objects may
have different sizes; that size need not be an int; memory locations are
addressed by a pointer-to-object, not by an int.

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