default value for struct member in C

Question

Is it possible to set default values for some struct member? I tried the following but, it\'d cause syntax error:

typedef struct
{
  int flag = 3;
} MyStruct         


        

Answer 1

Create a default struct as the other answers have mentioned:

struct MyStruct
{
    int flag;
}

MyStruct_default = {3};

However, the above code will not work in a header file - you will get error: multiple definition of 'MyStruct_default'. To solve this problem, use extern instead in the header file:

struct MyStruct
{
    int flag;
};

extern const struct MyStruct MyStruct_default;

And in the c file:

const struct MyStruct MyStruct_default = {3};

Hope this helps anyone having trouble with the header file.