Test Your C++ Knowledge with the Ultimate UB Quiz
adaptablebastio
Created 6/20/2024
Think you know all about Undefined Behavior in C++? Take this quiz and find out how many correct answers you can score out of 20!
1. What does UB stand for in C++?
Undefined Behavior
Unbounded Buffer
2. Which of the following is NOT a cause of UB in C++?
Array index out of bounds
Valid memory allocation
3. What can UB lead to in a program?
Crashes or unexpected behavior
Compiling errors
4. Accessing a null pointer in C++ results in?
Undefined Behavior
Defined Behavior
5. Dereferencing an invalid iterator in C++ causes?
Undefined Behavior
Memory Leak
6. Using an uninitialized variable in C++ can lead to?
Undefined Behavior
Compile-time warning only
7. Does integer overflow cause UB in C++?
Yes, it can lead to UB
No, it always results in a specific wrap-around value
8. What happens when a program divides by zero in C++?
Undefined Behavior
Exception thrown
9. Modifying a const object in C++ results in?
Undefined Behavior
Compilation Error
10. Which of the following can lead to UB?
Violating type-aliasing rules
Assigning a new value to a var
11. Calling a deleted function in C++ leads to?
Undefined Behavior
Compilation Error
12. Does using a pointer after it has been deleted cause UB?
Yes, it causes UB
No, it is safe
13. Are out-of-bounds array accesses considered UB?
Yes, they result in UB
No, they are caught at compile-time
14. What does reading from a union member other than the last one written to lead to in C++?
Undefined Behavior
Compiler-dependent behavior
15. Is calling a virtual function from a destructor UB?
Yes, it can cause UB
No, it is always safe
16. Using an object after it has been moved from can lead to?
Undefined Behavior
Defined behavior if using std::move
17. Accessing a member of a structure through a differently-typed pointer variable causes?
Undefined Behavior
No problems, fully allowed
18. Which of the following does NOT result in UB?
Using a properly initialized STL container
Double free on dynamic memory
19. Reinterpreting a pointer of one type to another incompatible type leads to?
Undefined Behavior
Valid pointer conversion
20. Is modifying a const object through a const_cast defined behavior?
No, it results in UB
Yes, it is defined behavior
