IT Quiz Round 3

Which of the following functions initializes the allocated memory to zero?

• malloc()

• calloc()

• realloc()

• free()

How do you declare a pointer to a function that returns int and takes float as an argument?

• int (*fptr)(float);

• float (*fptr)(int);

• int fptr(float);

• float fptr(int);

What is the size of s1 in the following structure on a 32-bit system? struct test { char c; int i; short s; }s1;

• 7

• 8

• 12

• 10

Which of the following causes a dangling pointer?

• Using malloc() without free()

• Returning the address of a local variable from a function

• Dereferencing a NULL pointer

• Using calloc() instead of malloc()

What is the best approach to prevent deadlocks in Java?

• Using multiple synchronized blocks on different objects

• Always acquiring locks in the same order

• Using wait() without notify()

• Using busy-wait loops with Thread.sleep()

Which of the following is NOT a feature of object-oriented programming in Java?

• Abstraction

• Encapsulation

• Inheritance

• Multithreading

How can you create an immutable class in Java?

• By making all methods final

• By making the class final and ensuring that fields are final and have no setters

• By marking the class as abstract

• By marking the class as private

What will be the output of the code? int arr[] = {1,2,3}; main() { int *parr; parr = arr; printf("%d", *(parr + 5)); }

• 8

• 1,2,3

• Garbage value

• Error

What will be the output of the following code? #include int f(int x); int main() { int res = f(7); printf("%d\n", --res); return 0; } int f(int x) { return(x++); }

• 7

• 6

• Error

• None of these

What will be the output of the following code?

int main() { int res = f(7);

printf("%d\n", --res); return 0;

}

int f(int x) { return(x++);

}

• 7

• 6

• Error

• None of these