C语言教程:sizeof 运算符 sizeof运算符返回指定变量或数据类型在内存中占用的字节大小 。这在不同的系统上可能有所不同,除了char和它的变体,始终为 1 个字节。 由于sizeof计算存储类型所需的字节数,因此您可能认为sizeof会返回一个int或者大小不能为负的整数,也许是一个unsigned。 但事实证明 C 有一种类型来...
#define offsetof(s,m) (size_t)&(((s *)0)->m) 例如,想要获得S2中c的偏移量,方法为 1 size_tpos = offsetof(S2, c);// pos等于4 2) 基本类型是指前面提到的像char、short、int、float、double这样的内置数据类型,这里所说的“数据宽度”就是指其sizeof的大小。由于结构体的成员可以是复合类型,比...
structs3 {chara;charc;intb;shortd; };structs4 {chara;charc;shortd;intb; };structs3 s3 = {'a','b',0xFFFFFFFF,0xFFFF}; printf("%lu\n",sizeof(s3));//12structs4 s4 = {'a','b',0xFFFF,0xFFFFFFFF}; printf("%lu\n",sizeof(s4));//8 看来上面的是不是感觉可以了? 来看看下...
1. 定义:sizeof是何方神圣sizeof乃C/C++中的一个操作符(operator)是也,简单的说其作用就是返回一个对象或者类型所占的内存字节数。MSDN上的解释为:Thesizeofkeyword gives the amount of storage, in bytes, associated with avariable or a type (including aggregat ...
you cannot implementsizeofoperator in standard C as a macro or function. You can do a trick to get the size of a variable by pointer arithmetic. However, pointer arithmetic underneath uses thesizeofoperator to figure out the size of the type in order to increment or decrement the pointer ...
C - For loop C - Do...while loop C - Nested loop C - Infinite loop C - Break Statement C - Continue Statement C - goto Statement Functions in C C - Functions C - Main Function C - Function call by Value C - Function call by reference C - Nested Functions C - Variadic Functions...
mappingproxy({'setxy':<function CC.setxy at 0x00000000031F9B70>, 'printxy': <functionCC.printxy at 0x00000000031F9BF8>, '__module__': '__main__', '__weakref__':<attribute '__weakref__' of 'CC' objects>, '__dict__': <attribute '__dict__'of 'CC' objects>, '__doc__'...
Let’s learn how it works with different datatypes in C#: Assert.AreEqual(1,sizeof(byte));// true Assert.AreEqual(2,sizeof(short));// true Assert.AreEqual(4,sizeof(int));// true Assert.AreEqual(8,sizeof(long));// true
1.设有如下定义,则表达式sizeof(y)的值是 【】。struct data{ long *In;char c;struct data *last, *next;}y;(A)7(B)9(C)13( D )17 相关知识点: 试题来源: 解析 【答案】A 【解析】指针变量在内存中占用2个字节,所以sizeof(y)的值是2+1+2+2=7。
CharUnits&Size){// sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc// ex...