news 2026/4/27 20:33:37

【C/C++】自定义类型:联合和枚举

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张小明

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【C/C++】自定义类型:联合和枚举

给联合体其中⼀个成员赋值,其他成员的值也跟着变化。

代码语言:javascript

AI代码解释

#include <stdio.h> //联合类型的声明 union Un { char c;//1 int i;//4 }; int main() { //联合变量的定义 union Un un = {0}; //计算两个变量的⼤⼩ printf("%d\n", sizeof(un)); return 0; }

输出的结果:

代码语言:javascript

AI代码解释

4

为什么是4呢?

1.2 联合体的特点

联合的成员是共⽤同⼀块内存空间的,这样⼀个联合变量的⼤⼩,⾄少是最⼤成员的⼤⼩(因为联合 ⾄少得有能⼒保存最⼤的那个成员)。

代码语言:javascript

AI代码解释

//代码1 #include <stdio.h> //联合类型的声明 union Un { char c; int i; }; int main() { //联合变量的定义 union Un un = {0}; // 下⾯输出的结果是⼀样的吗? printf("%p\n", &(un.i)); printf("%p\n", &(un.c)); printf("%p\n", &un); return 0; }

在这里插入图片描述

代码语言:javascript

AI代码解释

001AF85C 001AF85C 001AF85C

代码语言:javascript

AI代码解释

//代码2 #include <stdio.h> //联合类型的声明 union Un { char c; int i; }; int main() { //联合变量的定义 union Un un = {0}; un.i = 0x11223344; un.c = 0x55; printf("%x\n", un.i); return 0; }

代码语言:javascript

AI代码解释

11223355

代码1输出的三个地址⼀模⼀样,代码2的输出,我们发现将i的第4个字节的内容修改为55了。 我们仔细分析就可以画出,un的内存布局图。

在这里插入图片描述

1.3 相同成员的结构体和联合体对⽐

我们再对⽐⼀下相同成员的结构体和联合体的内存布局情况。

代码语言:javascript

AI代码解释

struct S { char c; int i; }; struct S s = {0};

代码语言:javascript

AI代码解释

union Un { char c; int i; }; union Un un = {0};

在这里插入图片描述

1.4 联合体大小的计算

• 联合的大小⾄少是最⼤成员的⼤⼩。

当最⼤成员⼤⼩不是最⼤对⻬数的整数倍的时候,就要对齐到最大对齐数的整数倍。

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