Infosys SDE (Software Development Engineer) Interview Questions and Answers

Dictionaries are a built-in data type in Python used to store key-value pairs.

• Keys must be unique and immutable.

• Values can be of any data type.

• Access values using keys.

• Add or modify values using keys.

• Use the 'in' keyword to check if a key exists in the dictionary.

• Use the 'len()' function to get the number of key-value pairs in the dictionary.

An array is a collection of elements of the same data type, stored in contiguous memory locations.

• Arrays have a fixed size and can be accessed using an index.

• Elements in an array can be of any data type, including other arrays.

• Arrays are commonly used in programming for storing and manipulating data.

• Example: int[] numbers = {1, 2, 3, 4, 5};

• Example: char[] letters = {'a', 'b', 'c'};