c - 如何初始化嵌套数组

Question

初始化以下 2 级嵌套数组的正确语法是什么？

z3 src # cat tc.c
#include <stdio.h>

typedef struct level1_t {
        char                           var[15];
        int                            value;
} level1_t;

typedef struct level2_t {
    level1_t     data[3];
} level2_t;

level2_t level2[1] = {
                [0]={
                        [0]={"one",1},
                        [1]={"two",2},
                        [2]={"three",3}
                }
};

int main() {

        printf("%s\n",level2[0].data[1].var);
}
z3 src # gcc -ggdb -o tc tc.c
tc.c:14:4: error: array index in non-array initializer
tc.c:14:4: error: (near initialization for 'level2[0]')
tc.c:15:4: error: array index in non-array initializer
tc.c:15:4: error: (near initialization for 'level2[0]')
tc.c:15:4: error: extra brace group at end of initializer
tc.c:15:4: error: (near initialization for 'level2[0]')
tc.c:15:4: warning: excess elements in struct initializer
tc.c:15:4: warning: (near initialization for 'level2[0]')
tc.c:16:4: error: array index in non-array initializer
tc.c:16:4: error: (near initialization for 'level2[0]')
tc.c:16:4: error: extra brace group at end of initializer
tc.c:16:4: error: (near initialization for 'level2[0]')
tc.c:16:4: warning: excess elements in struct initializer
tc.c:16:4: warning: (near initialization for 'level2[0]')
z3 src #

Answer 1

改变

level2_t level2[1] = {
                [0]={
                        [0]={"one",1},
                        [1]={"two",2},
                        [2]={"three",3}
                }
};

到

level2_t level2[1] = {
                [0].data = {
                        [0]={"one",1},
                        [1]={"two",2},
                        [2]={"three",3}
                }
};

现在您正在尝试将结构初始化为数组，同时您需要初始化 data 字段。

正如您在评论中所问，这里是如何在没有索引的情况下做同样的事情:

level2_t level2[] = {
    {
        .data = {
            {"one", 1},
            {"two", 2},
            {"three", 3}
        }
    }
};