Question

following is the structure and I want to create array of this structure in C and initialize, but confuse with how to initialize char **input and char **output.

typedef struct _test_data_vector {
    char *api;
    char **input;
    char **output;
}vector_test_data;

following is what I tried.

typedef struct _test_data_vector {
    char *api;
    char **input;
    char **output;
}vector_test_data;

vector_test_data data[] = {
    {
        "vector_push_back",
        {"1","2","3","4","5","6","7","8","9","10"},
        {"1","2","3","4","5","6","7","8","9","10"}
    }
};

Answer 1

You’re very close, just specify type through compound literals (starting from C99)

This what I’ve tested with no warnings:

typedef struct _test_data_vector {
    char *api;
    char **input;
    char **output;
}vector_test_data;

vector_test_data data[] = {
    {
        "vector_push_back",
        (char*[]){"1","2","3","4","5","6","7","8","9","10"},
        (char*[]){"1","2","3","4","5","6","7","8","9","10"}
    }
};

printf("TEST: %s", data[0].input[2]);

Otput: TEST: 3