C++ MQCs with Explanation (CHAPTER 4: FUNCTIONS IN C++)

Which one of the following is true about a function in a C++ program?

1. A function must be called at least once
2. A function may called as and when required.
3. A function can be called only by the main function
4. A function must always return a value

---

Answer: 

Option b: A function may called as and when required.

---

Explanation Here