BugBlitz

Q1: What is the output?

(Pointer Arithmetic & Undefined Behavior)

c

#include <stdio.h>

int main()

{ int arr[] = {10, 20, 30};

int *p = arr;

printf("%d", p++ + ++*p);

return 0; }

• 21

• 31

• Undefined Behaviour

• Compilation Error

Q2: What does this code print?

(Function Pointers & Recursion)

c

#include <stdio.h>

int (*func(int x))(int) {

return x > 0 ? func : NULL; }

int main() {

printf("%p", func(5)(0));

return 0; }

• 0

• segmentation fault

• Address of func

• Compilation Error

Q3: What is the output? (Templates & SFINAE)

cpp

#include <iostream>

template auto foo(T x) -> decltype(x + 1)

{ return x + 1;

} int main()

{ std::cout << foo("hello");

return 0; }

• hello1

• Compilation Error

• Undefined Behavior

• Runtime Error

Q4: What does this code output? (Lambda & Capture Semantics)

cpp

#include <iostream>

int main() {

int x = 10;

auto f = [&x]() mutable { x = 20; };

f(); std::cout << x; return 0; };

• 10

• 20

• Comilation Error

• Undefined Behavior

Q5: What is the output? (Metaclasses & Inheritance)

python

class Meta(type):

def new(cls, name, bases, dct):

dct['x'] = 100

return super()._new_(cls, name, bases, dct)

class A(metaclass=Meta):

pass

print(A.x)

• 100

• AttributrError

• TypeError

• 0

Q6: What does this code print? (Generator Coroutines)

python

def gen():

yield (yield (yield 1))

g = gen()

print(next(g))

print(g.send(2))

print(g.send(3))

• 1 2 3

• 1 3 stopiteration

• 1 2 stopiteration

• TypeError

Q7: What happens with this CSS Grid? (Subgrid & Alignment)

css

.container {

display: grid;

grid-template-columns: subgrid;

gap: 10px;

}

.item {

grid-column: span 2; }

• Items span 2 columns in a subgrid

• subgrid is invalid

• Items stack vertically

• Overlapping items

Q8: What does this HTML + Shadow DOM code do?

javascript

const div = document.createElement('div');

const shadow = div.attachShadow({ mode: 'closed' });

shadow.innerHTML = <style>p {color; red; } <style><p>Hello</p>

; document.body.appendChild(div);

console.log(shadow.querySelector('p'));

• Logs <p>

  element

• Logs null

• Throws TypeError

• Logs undefined

Q9: What is the output? (Promise Chaining & Microtasks)

javascript

Promise.resolve()

.then(() => console.log(1))

.then(() => {

Promise.resolve().then(() => console.log(2)); }) ;

.then(() => console.log(3));

• 1 2 3

• 1 3 2

• 2 1 3

• 3 2 1

Q10: What does this Proxy code log? (Reflect API & Traps)

javascript

const obj = { x: 10 };

const proxy = new Proxy(obj, {

get(target, prop) {

return Reflect.get(target, prop) * 2;

}

});

console.log(proxy.x + obj.x);

• 20

• 10

• 30

• TypeError