Question 2

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

	True
Statement A
Statement B
Statement C
Statement D
Statement E

• Statement A

  The output of the following program run is empty, and the exit status is 0.

  $ ./example2 0
  $ echo $?
  0
  

• Statement B

  (Abbreviated; meaning the output and exit status are as shown)

  $ ./example2 1
  Foo()
  bar()
  ~Foo()
  $ echo $?
  0
  

• Statement C

  (…)

  $ ./example2
  need one parameter
  $ echo $?
  0
  

• Statement D

  The program has a memory leak

• Statement E

  The program’s behavior is undefined

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;
}