Alcon Intern Interview Questions, Process, and Tips

Find the second largest number in an array.

• Sort the array in descending order

• Return the element at index 1

Program to add two numbers without using the '+' operator.

• Use bitwise operators like XOR and AND to perform addition without '+' operator.

• XOR the two numbers to get the sum without carry.

• AND the two numbers and left shift the result to get the carry.

• Repeat the process until carry becomes zero.

Mutable data types can be modified after creation, while immutable data types cannot be modified.

• Examples of mutable data types: lists, sets, dictionaries

• Examples of immutable data types: strings, tuples, frozensets

A dictionary is an unordered collection of key-value pairs, while a list is an ordered collection of elements.

• Dictionaries are accessed by keys, while lists are accessed by indices.

• Dictionaries are mutable, while tuples are immutable.

• Dictionaries can have duplicate values, but not duplicate keys.

• Lists can contain elements of different data types, while tuples can contain elements of the same or different data types.

Yes, a dictionary is mutable in Python.

• A dictionary in Python can be modified by adding, updating, or deleting key-value pairs.

• The values associated with keys in a dictionary can be changed.

• Dictionaries are mutable objects, meaning they can be modified in-place.

• The 'update()' method can be used to add or update multiple key-value pairs at once.

A program to determine if a number is prime or not.

• A prime number is a number greater than 1 that has no positive divisors other than 1 and itself.

• To check if a number is prime, iterate from 2 to the square root of the number and check if any of them divides the number evenly.

• If any divisor is found, the number is not prime. Otherwise, it is prime.