1. An online shopping application has a Cart class that stores Product objects. How should this relationship be modeled?

2. In an ecommerce system, you want to hide sensitive user details like passwords. Which OOP principle helps achieve this?

3. Which of the following is not a valid reason to use an interface in Java?

4. What is the output of the following code?

#include

int main() {

int x = 10;

if (x == 10)

printf("x is 10\n");

else;

printf("x is not 10\n");

return 0;

}

5. Which of these is NOT a property of std::shared_ptr?

6. What would be output following C program?

#include
int main()
{
int iVal;
char cVal;
// void pointer
void* ptr;
iVal = 50;
cVal = 65;
ptr = &iVal;
printf("value =%d, size= %d\n", *(int*)ptr, sizeof(ptr));
ptr = &cVal;
printf("value =%d, size= %d\n", *(char*)ptr, sizeof(ptr));
return 0;
}

7. What will be the output of the following code?
java
class Test {
public static void main(String[] args) {
String s1 = "abc";
String s2 = new String("abc");
System.out.println(s1 == s2);
}
}

8. What is the output of the following code?

#include

#define SQUARE(x) x * x

int main() {

printf("%d", SQUARE(3 + 1));

return 0;

}

9. What is the output of this code?

#include

int main() {

int x = 10;

auto lambda = [&]() { x += 5; };

lambda();

std::cout << x; return 0; }

10. Which C++ feature does the "Rule of Five" pertain to?

11. What is the output of this code?

#include

int main() {

char str[] = "C Programming";

printf("%c", *(str + 3));

return 0;

}

12. In a payment gateway system, retrying a failed transaction can cause data corruption if not handled carefully. What technique helps avoid this?

13. A bank application requires different types of accounts such as SavingsAccount and CurrentAccount. What OOP concept is used to achieve this?

14. What is the output of the following?

#include

int main() {

for (int i = 0; i < 5; ++i) { if (i == 3) continue; std::cout << i; } return 0; }

15. Which type of cast is considered safest in C++?

16. Which keyword is used to resolve ambiguity in multiple inheritance?

17. A car rental system has a Vehicle class with subclasses like Car and Bike. If Vehicle cannot be instantiated, which feature is being used?

18. What is the return type of the main function in C?

19. What is the output of this program?

#include

int main() {

const int x = 10;

int *ptr = const_cast(&x);

*ptr = 20;

std::cout << x; return 0; }

20. What will be the output of following program?

#include
void main()
{
if (printf("cisgood"))
printf("i know c");
else
printf("i know c++");
}