嵌套结构变量初始化

问题描述

如何在C中初始化此嵌套结构?

How can I initialize this nested struct in C?

typedef struct _s0 {
   int size;
   double * elems;
}StructInner ;

typedef struct _s1 {
   StructInner a, b, c, d, e;
   long f;
   char[16] s;
}StructOuter;  StructOuter myvar = {/* what ? */ };

推荐答案

要将所有内容初始化为0(正确的类型)

To initialize everything to 0 (of the right kind)

StructOuter myvar = {0};

要将成员初始化为特定值

To initialize the members to a specific value

StructOuter myvar = {{0, NULL}, {0, NULL}, {0, NULL},
                     {0, NULL}, {0, NULL}, 42.0, "foo"};
/* that's {a, b, c, d, e, f, s} */
/* where each of a, b, c, d, e is {size, elems} */

---

编辑

如果您使用的是C99编译器，则还可以使用指定的初始化程序"，如下所示:

If you have a C99 compiler, you can also use "designated initializers", as in:

StructOuter myvar = {.c = {1000, NULL}, .f = 42.0, .s = "foo"};
/* c, f, and s initialized to specific values */
/* a, b, d, and e will be initialized to 0 (of the right kind) */

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