struct test1
{
   int i;
   char c;
   char text[512];
}

struct test1 varstruct1;

varstruct1.i = 10;
varstruct1.c = 'a';
strncpy(varstruct.text, "Das ist ein Text", sizeof(varstruct.text));

void function1(const struct test1 * ptr) //Pointer
{
   printf("%i\n", ptr->i);
}

function1(&varstruct1);

typedef struct test2
{
   int i;
   char c;
   char text[512];
} Test2, *PTest2;

Test2 varstruct2;

void function2(const PTest2 ptr) //Pointer
{
   printf("%s\n", ptr->text);
}

function(&varstruct2);