是否可以为某些 struct 成员设置默认值？
typedef struct
{
int flag = 3;
} MyStruct;
错误:
$ gcc -o testIt test.c
test.c:7: error: expected ‘:’, ‘,’, ‘;’, ‘}’ or ‘__attribute__’ before ‘=’ token
test.c: In function ‘main’:
test.c:17: error: ‘struct <anonymous>’ has no member named ‘flag’
struct 是data type.您不会给数据类型赋值.您为数据类型的实例/对象赋值.
所以不，这在C中是不可能的.
相反，您可以编写一个函数来执行 struct 实例的初始化.
或者，你可以:
struct MyStruct_s
{
int id;
} MyStruct_default = {3};
typedef struct MyStruct_s MyStruct;
然后始终将新实例初始化为:
MyStruct mInstance = MyStruct_default;