Question

我将同样的直观价值分配给点人和<条码>。阵容

char *str = "hello" "world";  
char str1[] = "hello" "world";

然后使用<代码>sizeof()

sizeof(str);     //  on my computer, it s 8 !!
sizeof(str1);    //  return 11, which is right

但两者均可通过<>%予以印刷:

printf("%s
%s
", str, str1);

因此,sizeof(str);return a wrong Value?

Answer 1

因此,大小为何?

这并不是因为<条码>>>通过斜体表示其歌剧的大小。页: 1 C99标准(第869条草案)第2条:

www.un.org/spanish/ecosoc <sizeof营运人产生其歌剧体(以斜体表示)的大小,可能是一种表达方式或一种类型的母体名称。大小由歌剧类型决定。结果是愤怒的。如果歌剧的类型是不同的系列,则对歌剧进行评价;否则,对歌剧不作评价,结果是惯性的。

Therefore:

sizeof(str)  == sizeof(char*)
sizeof(str1) == sizeof(char[11])

Answer 2

The first one is a pointer. You don t count the number of chars but the size of the pointer in memory. You need to understand the difference. char* point to a position in memory that you assume contains chars in a row. char[x] IS a position in memory which has x chars on a row there.

Answer 3

价值8是指点员的大小,因为梯体实际上是一个指点,即,你可以将其重新定位到另一个直面。

The variable str1 is an array of characters and as such cannot be reassigned and its size is related to the size of the array.

Answer 4

First one is pointer to char, other one is array. Pointer points to one char only, size is one byte.

你可以将果园用作阵列,但你们需要知道,可以分开。

Answer 5

http://www.un.org/Depts/DGACM/index_spanish.htm 因此,您的<代码>sizeof()将退回不同的数值,并交回类型大小,而不是座标的长度。

您应使用<代码>strlen(),以检查地体大小。铭记用<代码>strlen(>对每一条进行检测时,必须终止()。

对于常数(使用“普通”法的计算法),汇编者添加了终止无效的内容。

对C方案拟订语言本身所载示意图的唯一支持是,汇编者将把引证的常态转化为无名的扼杀,储存在静态记忆中。

https://en.wikipedia.org/wiki/C_string_handling

Answer 6

char *ss = "hello";
char sa[6] = "hello";
char sc[6] = { h , e , l , l , o ,0x0};
printf("mem: %p  ",ss);
printf("mem: %p  ",sa);
printf("mem: %p  ",sc);

printf("size: %d  ",sizeof(ss));
printf("size: %d  ",sizeof(sa));
printf("size: %d  ",sizeof(sc));

printf("size: %x  ",sizeof(&ss));
printf("size: %x  ",sizeof(&sa));
printf("size: %x  ",sizeof(&sc));

printf("ptr: %d  ",sizeof(void*));
printf("chr: %d  ",sizeof(char));
printf("int: %d  ",sizeof(int));
printf("
");

//This will show some of the reason 
//that the sizeof operator returns 
//unexpected results.
//Note that the sizeof operator
//returns the size in bytes

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