Question 2

Which of the following statements about the program below are true?

Statement	True
The output of the following program run is empty, and the exit status is 0. $ ./example2 0 $ echo $? 0

Statement	True
Output and exit status are: $ ./example2 1 Foo() bar() ~Foo() $ echo $? 0

Statement	True
Output and exit status are: $ ./example2 need one parameter $ echo $? 0

Statement	True
The program has a memory leak

Statement	True
The program’s behavior is undefined

Note: std::stoi() converts its parameter to int, or raises an exception if that is not convertible (e.g. "xxx")

code/example2.cpp

#include <iostream>
#include <string>

class Foo
{
public:
    Foo() {
        std::cout << "Foo()" << std::endl;
    }
    ~Foo() {
        std::cout << "~Foo()" << std::endl;
    }
    void bar() const {
        std::cout << "bar()" << std::endl;
    }
};

int main(int argc, char** argv)
{
    Foo* f = nullptr;

    if (argc != 2) {
        std::cerr << "need one parameter" << std::endl;
        return 1;
    }
    int i = std::stoi(argv[1]);
    if (i)
        f = new Foo;
    if (i)
        f->bar();
    if (i)
        delete f;

    return 0;
}