error: invalid type argument of unary '*' (have 'int')

Question

error: invalid type argument of unary '*' (have 'int')

struct test_t {
    int var1[5];
    int var2[10];
    int var3[15];
}

test_t* test;
test->var1[0] = 5;

How can I solve this problem?

Answer 1

You should write:

struct test_t* test;

Or use typedef if you want to avoid writing struct every time you declare a variable of that type:

typedef struct test_t {
    int var1[5];
    int var2[10];
    int var3[15];
} test_t;

test_t* test;

Side note: In C++ the struct name is placed in the regular namespace, therefore there is no need to write struct before declaring a variable of that type.

Answer 2

When you declare a structure variable, struct keyword should be there like

struct test_t* test;

If you don't want to use struct keyword every time you declare a variable, simply use typedef .