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);

struct test3
{
   int i;
   char c;
   char text[512];

   test2() { *text = 0; i = 0; c = 0; } // konstructor
   void print() { printf("%i, %s, %s\n", i, &c, text); }
}

test3 varstruct3;

varstruct.print();

varstruct.i = 10;

varstruct.print();

void function3(const test3 * ptr) // pointer
{
   test3->print();
}

void funbction3(const test3 & ref) // referenz
{
   ref.print();
}