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struct A
{
    int  wert;
};

struct B
{
    struct A  *tmp;
}st1;

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struct A
{
    int wert;
};



//...
struct A str_a;
str_a.wert = 5;

struct A *str_ap = (struct A*)malloc(sizeof(struct A));
str_ap->wert = 5;

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struct B
{
    int *pointer;
};



//...
struct B str_b;
str_b.pointer = (int *)malloc(sizeof(int));
*(str_b.pointer) = 5;

struct B *str_bp = (struct B*)malloc(sizeof(struct B));
str_bp->pointer = (int*)malloc(sizeof(int));
*(str_bp->pointer) = 5;

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st1->tmp->wert = 5;

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x->y

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(*x).y

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(*st1).(*tmp).wert