Inconsistent results from printf with long long int?

Question

struct DummyStruct{
        unsigned long long std;
        int type;
};

DummyStruct d;
d.std = 100;
d.type = 10;

/// buggy printf, unsigned long long to int conve         


        

Answer 1

The %d argument tells printf to interpret the corresponding argument as an int. Try using %llu for long long. And memorize this reference card.

(So no, it's not a bug)