Carwale Software Developer Trainee Interview Questions and Answers

Five coding questions along with technical questions focusing on Object-Oriented Programming (OOP) and the expected output of Java programs.

Q1. Can you tell me about yourself?
Ans. 
I am a recent graduate with a degree in Computer Science and a passion for coding and problem-solving.
• Graduated with a degree in Computer Science

• Proficient in programming languages such as Java, Python, and C++

• Completed internships at tech companies like Google and Microsoft

• Enthusiastic about learning new technologies and collaborating with team members
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Q2. Find height of binary tree, Find first repeating character, Find number of Islands
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The candidate is asked to solve three common coding problems related to binary trees, strings, and matrices.
• To find the height of a binary tree, you can use a recursive function to traverse the tree and calculate the height at each node.

• To find the first repeating character in a string, you can use a hashmap to store the frequency of each character and then iterate through the string to find the first character with a ...read more
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Q1. Based on project
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Q1. Didn't Qualify for it
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Test contains 26 questions for me 13 are java based 13 are c++ based

Q1. Indexing in dbms
Ans. 
Indexing in DBMS is a technique to improve the performance of queries by creating a data structure that allows for faster retrieval of data.
• Indexes are created on columns in a database table to speed up the retrieval of rows that match a certain condition.

• Types of indexes include clustered, non-clustered, unique, and composite indexes.

• Examples of indexing techniques include B-tree, hash, and bitmap indexes.

• Indexing can...read more
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Q2. Find whether two strings are or not anagrams
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Check if two strings are anagrams by comparing the sorted characters in each string.
• Sort the characters in both strings and compare if they are equal.

• Ignore spaces and punctuation when comparing the strings.

• Example: 'listen' and 'silent' are anagrams.

• Example: 'hello' and 'world' are not anagrams.
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Q1. Inorder traversal without recursion
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Use a stack to simulate the recursive inorder traversal process
• Create an empty stack to store nodes

• Start with the root node and push it onto the stack

• While the stack is not empty, keep traversing left and pushing nodes onto the stack

• Once you reach a leaf node, pop it from the stack, print its value, and move to its right child

• Repeat the process until all nodes have been visited
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Q2. How to make a class final
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To make a class final, use the 'final' keyword in the class declaration.
• Use the 'final' keyword before the 'class' keyword in the class declaration

• A final class cannot be subclassed or extended

• Final classes are often used for utility classes or classes that should not be modified
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