sizeof

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Does sizeof work at compile time?

I ran this sample program. const int x = 5; int main(int argc, char** argv) { int x[x]; int y = sizeof(x) / sizeof(int);[详细]

2023-03-30 14:22 分类：问答
Determine `sizeof float` without compilation

I\'d like to know the size of a float in GCC, without having to run the compiler. I know one option is to write a small function and have the compiler print out an assembly listing.[详细]

2023-03-30 10:38 分类：问答
sizeof and pass-by-reference

I am hoping that someone can explain the following behaviour. Suppose I am trying to implement a function which determines the length of any array, but want to avoid using macros. For e.g[详细]

2023-03-27 18:08 分类：问答
C++: getting the row size of a multidimensional array passed to a function

I\'m trying to write a function that will print out the contents of a multidimensional array. I know the size of the columns, but not the size of the rows.[详细]

2023-03-25 07:44 分类：问答
Can I assume sizeof(GUID)==16 at all times?

The definition of GUID in the windows header\'s is like this: typedef struct _GUID { unsigned long Data1;[详细]

2023-03-25 04:52 分类：问答
What is meant by "Nominal storage allocation" in the context of primitive data type allocation size?

Looking at this table describing the data types in VB. One of the columns is labeled \"Nominal s开发者_如何学Pythontorage allocation\".What does this mean?Why is the word \"nominal\" here?I believe t[详细]

2023-03-24 16:16 分类：问答
Size of classes with virtual functions GCC/Xcode

Can anyone explain to me what is going on here? First off, I think most programmers know that a class with a virtual function has a vtbl and thus has 4 extra bytes on the top of it. As far as I know,[详细]

2023-03-24 01:07 分类：问答
Conditional Compilation and compile time evaluation of expressions in ANSI C

I would like to do the following, but the compiler doesn\'t like it: unsigned short foo = 1; // do something with foo[详细]

2023-03-23 02:52 分类：问答
C - sizeof() on static char arrays inside a struct - impossible?

I need to store two items per array element — two arrays of char, which might contain null bytes — and then still be able to use sizeof() to get their length.Since these values will not ch[详细]

2023-03-22 23:24 分类：问答
Behaviour of Sizeof in C

I have learnt that when we pass the array name to sizeof, the name of the array does not decay to the pointer to base address. The code below verifies this fact by giving answer 10.[详细]

2023-03-22 20:53 分类：问答