C++ (Find the errors and Solve the problem)

[MarkCuering]

---

Check the code below... please provide explaination

#include <iostream>
using namespace std;

// Leave this class unchanged.
class cDriver {
    public:
        int age;
        int license;
    };

// you can edit this function.
cDriver* myFunc() {
    cDriver D;
    cDriver* pD = &D;
    pD->age = 27;
    return pD;
}
// you can edit below main, with the desired output.
int main(int argc, char *argv[])
{    
    cDriver* d;    
    d = myFunc(); 
    
    cout << d->age << endl;
    cout << "Display Age: " << d->age << endl;
    d->age = 27;  
    d->license = 4413;  

    cout << "age: " << d->age << endl;
    cout << "gpa: " << d->license << endl;
      
    system("PAUSE");
    return 0;
}

sample output from above code:

27
Display Age: 0
age: 0
gpa: 104724280
Press any key to continue . . .

Desired output:

27
Display Age: 27
age: 27
gpa: 4413
Press any key to continue . . .

I don't know what's the difficulty level of this problem, just try to solve it.

GOODLUCK...!

[Badekdek]

int main(int argc, char *argv[])
{
cDriver* d;
d->age = 27;
d->license = 4413;
d = myFunc();

cout << d->age << endl;
cout << "Display Age: " << d->age << endl;


cout << "age: " << d->age << endl;
cout << "gpa: " << d->license << endl;

system("PAUSE");
return 0;
}

[MarkCuering]

aw... please read and anlayse review your pointers topic and how to point memory location properly.
horrible ---> cDriver* d;

[Badekdek]

nice try for me. i dont do c++ actually.

maybe this one:
d = malloc(sizeof(cDriver));

well, back to java now.

[nullpointer]

int main(int argc, char *argv[])
{    
    cDriver d;
    cDriver* pd = myFunc();
    d = *pd;

    cout << d.age << endl;
    cout << "Display Age: " << d.age << endl;
    d.age = 27;  
    d.license = 4413;
    cout << "age: " << d.age << endl;	 
    cout << "gpa: " << d.license << endl;
    system("PAUSE");
    return 0;
}

[MarkCuering]

@nullpointer,

you did a great job hope you can explain a bit., :P is it accidentally discover? hoping your honest share 2-3 of my collegues code it that why, BUT, there's still an issue right there, still had some bugs and overhead.

I wonder why you didn't use the "->" operator. can you resolve using both (dot) and "->" operator?

eg.

cout << d.age;
cout << pd->age;

again, nice try...

[nullpointer]

...its only accidental...i'm still wondering why it won't run if using pointers (e.g cDriver* pD)...

[MarkCuering]

nice try for me. i dont do c++ actually.

maybe this one:
d = malloc(sizeof(cDriver));

well, back to java now.

can you share your complete code? this might open a new topic, maybe you got some idea of using malloc, you're working with JAVA? I thought you will gonna use the one that specify the number of objects to allocate instead of bytesize to allocate. AFAIK, malloc returns a NULL in case there's no room for data to be allocated.

you almost got it anyway on this kind of solution.

[MarkCuering]

...its only accidental...i'm still wondering why it won't run if using pointers (e.g cDriver* pD)...

hahahaha... yes it can't be helped..., its kinda tricky, but its really nice thing to workout. surely you will hit this over and over again if ever you will forget this rule.

[doomsweek]

I don't know C++ but know a little C and Java. Here's my solution.

With a big help from Stack Overflow.