题目
题目

DD2360/FDD3360 HT25 (appgpu25) Quiz 1: Basic knowledge

判断题

We have a C source code file named "particletest.c", where we are defining a data structure that represents the position of a particle in (X,Y,Z). The idea is to have particle variable of type Particle, that internally contains a variable position of type Position. We have declared these two structures and the particle variable as follows: ··· struct { float x, y, z; } Position; struct { struct Position position; } Particle; int main() { struct Particle particle = { 0 }; particle.position.x = 2; particle.position.y = 1; ··· } Do you consider that this code would compile correctly as it is?

选项
A.True
B.False
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标准答案
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思路分析
First, examine what the code is actually declaring. The line 'struct { float x, y, z; } Position;' defines an anonymous struct type and then declares a variable named Position of that type. It does not create a type named Position that you can refer to as 'struct Position' later. Similarly, 'struct { struct Position position; } Particle;' declares another anonymous struct type and a variable named Particle of that type, but it......Login to view full explanation

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类似问题

One of the issues we observed in "particletest.c" was that the declaration of a variable that references a structure must use the struct keyword as well. For instance, let us take a look at the declaration of particle: ··· struct Particle particle = { 0 }; ··· To overcome this limitation, C allows us to declare new types by using the typedef keyword. This way, we have updated "particletest.c" to make the code more elegant and readable: ··· typedef struct { float x, y, z; } Position; typedef struct { Position position; } Particle; int main() { Particle particle = { 0 }; particle.position.x = 2; particle.position.y = 1; ··· } Given the fact that we are not specifying a tag anymore in the structure, is this code still correct?

One of the issues we observed in "particletest.c" was that the declaration of a variable that references a structure must use the struct keyword as well. For instance, let us take a look at the declaration of particle: 我们在"particletest.c"中发现的一个问题是：引用结构体的变量声明必须同时使用 struct 关键字。例如，我们来看一下 particle 的声明： ··· struct Particle particle = { 0 }; ··· To overcome this limitation, C allows us to declare new types by using the typedef keyword. This way, we have updated "particletest.c" to make the code more elegant and readable: 为了克服这一限制，C 语言允许使用 typedef 关键字来声明新类型。通过这种方式，我们更新了"particletest.c"使代码更加优雅和易读： ··· typedef struct { float x, y, z; } Position; typedef struct { Position position; } Particle; int main() { Particle particle = { 0 }; particle.position.x = 2; particle.position.y = 1; ··· } Given the fact that we are not specifying a tag anymore in the structure, is this code still correct? 考虑到我们不再在结构中指定标签，这段代码仍然正确吗？

We have a C source code file named "particletest.c", where we are defining a data structure that represents the position of a particle in (X,Y,Z). The idea is to have particle variable of type Particle, that internally contains a variable position of type Position. 我们有一个名为"particletest.c"的 C 源代码文件，其中定义了一个表示粒子在(X,Y,Z)位置的数据结构。目的是创建一个类型为 Particle 的粒子变量，其内部包含一个类型为 Position 的位置变量。 We have declared these two structures and the particle variable as follows: 我们按以下方式声明了这两个结构体和粒子变量： ··· struct { float x, y, z; } Position; struct { struct Position position; } Particle; int main() { struct Particle particle = { 0 }; particle.position.x = 2; particle.position.y = 1; ··· } Do you consider that this code would compile correctly as it is? 你认为这段代码在当前状态下能正确编译吗？

What does the deck[52] array contain in the following statement? struct card a, deck[52], *cPtr;  

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