parameterMystery2X

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< parameterMystery1X

parameterMystery3 >

Main Page → Exercises → C++ → Solve an Exercise

Language/Type: C++ parameters references reference parameters pointers string

The following code produces 5 lines of output. What is the output? Write each line of output as it would appear on the console.

For the purposes of this problem, assume that the variables in main are stored at the following memory addresses:

main's s1 variable is stored at address 0x1100
main's s2 variable is stored at address 0x2200
main's s3 variable is stored at address 0x3300
main's s4 variable is stored at address 0x4400
main's s5 variable is stored at address 0x5500
any memory dynamically allocated on the heap will be at address 0x777700

string* parameterMystery2X(string& s1, string s2) {
    s1 += "1";
    s2 += "2";
    cout << s2 << " -- " << s1 << endl;
    s1 += "!!!";
    return &s1;
}

int main() {
    string s1 = "hi";
    string s2 = "bye";
    string s3 = "yo";
    string* s4 = new string(s3);
    string* s5 = nullptr;

    parameterMystery2X(s1, s3);
    s5 = parameterMystery2X(*s4, s2);
    parameterMystery2X(s2, *s5);

    cout << s1 << " " << s2 << " " << s3 << endl;
    cout << s4 << " " << *s4 << " " << s5 << " " << *s5 << endl;

    return 0;
}

line 1
line 2
line 3
line 4
line 5

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parameterMystery2X