Placement prep + AI for engineers

Harshad Number (Niven Number): Algorithm, Programs in Python, Java, C

Learn what a Harshad number (Niven number) is, see worked examples, and get programs in Python, Java, and C to check any integer.

Check Whether a Character is an Alphabet: C, C++, Python, Java

Programs in C, C++, Python, and Java to check if a character is an alphabet, covering ASCII range logic, isalpha(), Unicode edge cases, and placement test traps.

9 May 2026 · 9 min read

Circle Geometry: Key Properties and Formulas for Placements

Master the circle geometry theorems that placement aptitude tests include. Covers chords, tangents, inscribed angles, and cyclic quadrilaterals with worked examples.

Classes and Objects in Python: Syntax, Examples, and OOP Basics

Learn how Python classes and objects work: class syntax, __init__, instance vs class attributes, and how OOP questions appear in placement rounds.

CoCubes Pre-Assess 2026: Registration, Test Pattern, and Prep

CoCubes Pre-Assess is the Aon-backed employability test for engineering freshers. Full 2026 guide: registration routes, 3-section test format, and preparation strategy.

Cognizant Recruitment Process 2026: Step-by-Step Guide

Cognizant's 2026 fresher recruitment: eligibility, GenC and GenC Elevate tracks, test format, interview rounds, and application process.

How to Organise Placement Prep by Target Company in 2026

A practical guide to company-specific placement prep for engineering students: test pattern, interview, and off-campus tracks, with a 4-week TCS NQT worked example.

How to Read Complicated Declarations in C

The right-left rule decodes any C declaration in a predictable sequence. Step-by-step examples for pointers, arrays, and function pointers, with cdecl cross-checks.

Constructors in Python: init, Default, and Parameterised

How Python constructors work: __init__ syntax, default vs parameterised patterns, the mutable-default-argument pitfall, and placement assessment context.

Binary to Octal Conversion in C, C++, Java and Python

Convert binary to octal using the group-of-3 method. C, C++, Java, and Python code with worked examples, edge-case handling, and O(n) complexity analysis.

Decimal to Binary Conversion in C, C++, Java, and Python

Four implementations to convert decimal to binary in C, C++, Java, and Python, with the algorithm, worked examples, and complexity analysis.

Octal to Binary Conversion in C, C++, Java and Python

Step-by-step octal to binary conversion with two methods, worked examples, and ready-to-run code in C, C++, Java and Python.

Decimal to Octal Conversion in C, C++, Java, and Python

Step-by-step decimal to octal conversion in C, C++, Java, and Python: division algorithm, built-in functions, and where this appears in placement coding tests.

Binary to Decimal Conversion: Algorithm, Code, and Edge Cases

Positional weighting, three verified worked examples, and C, Python, Java implementations, including built-in functions and signed-number edge cases.

Count Number of Digits in an Integer: 3 Methods

Three approaches to count digits in an integer: loop, recursion, and O(1) logarithm. Compare time complexity, edge cases, and what placement tests expect.

N-Digit Numbers with Non-Decreasing Digits: Two Approaches

Count n-digit sequences with non-decreasing digits using C(n+9,9). Stars-and-bars proof, DP solution, Python code, and worked examples for n=1 through n=5.

Crack CAT in 54 Hours: Section-by-Section Prep Plan

A 54-hour CAT prep plan across three sections: Quantitative Ability, DILR, and VARC. Covers realistic percentile targets, topic priorities, and mock test strategy.

Crack Wipro's Recruitment Process 2026: Round-by-Round Prep Plan

Round-by-round preparation for Wipro's 2026 NLTH, technical interview, and HR round, covering eligibility, section-wise syllabus, and the CoE-AI track.

Cryptarithmetic Practice Set for eLitmus and Infosys: 2026 Edition

Six verified cryptarithmetic problems with step-by-step solutions, covering 2-digit warmups through SEND+MORE=MONEY, for the Infosys aptitude test and eLitmus pH Test.

9 May 2026 · 12 min read

Infosys 2026: History, Services, and Fresher Hiring Guide

Founded in 1981, Infosys is India's second-largest IT firm: full history, services from Finacle to AI, and three fresher hiring tracks from ₹3.6 to ₹9.5 LPA in 2026.

Conceptual C MCQs for Placement Interviews

Five essential C programming MCQs on pointers, static variables, struct sizing, and token counting, with step-by-step traces for placement tests.

Deloitte Off-Campus Drive: 2026 Process and Eligibility Guide

Deloitte's off-campus drive runs three rounds: aptitude test, group discussion, and technical interview. Eligibility, documents, and prep plan for B.Tech freshers.

Diamond Pattern in Python: Two Programs Explained

Two Python programs to print full diamond and half-diamond star patterns, with the loop logic and space-count formula explained for placement prep.

9 May 2026 · 4 min read

Determiners in Sentence Correction: Complete Grammar Guide

Articles, demonstratives, quantifiers, and possessives tested in every placement verbal section. Rules, 10 worked examples, and error patterns.

Python Dictionaries: Operations, Methods, and Examples

Learn how Python dictionaries store key-value pairs: how to create, access, modify, delete, and iterate over them. Includes dict comprehensions and placement examples.

range vs xrange in Python: What Changed in Python 3

Python 2 had both range() and xrange(). Python 3 removed xrange() and made range() lazy. This guide covers memory behaviour, indexing gotchas, and when to use list().

Career Roadmap

Didn't Get Placed on Campus? Your Off-Campus Job Plan for 2026

Off-campus hiring runs year-round with thousands of fresher roles campus drives miss. Here's how to find them, apply effectively, and interview well.

Career Roadmap

Getting Placed Without Campus Drives: 6 Off-Campus Channels That Work

Six ways to get hired without a campus drive: off-campus openings, job portals, referrals, walk-ins, direct applications, and a working project that backs your resume.

Count Vowels in a Character Array Using Pointers in C

Step-by-step C program to count vowels in a character array using pointer arithmetic. Algorithm, traced output, case-insensitive variant, and complexity analysis.

Find All Missing Elements of a Range: 3 Approaches Ranked

Three approaches to find all missing elements of a range: from O(n) hashing to in-place marking, with complexity tables and placement interview context.

Find All Nodes at K Distance from Root in a Binary Tree

Two methods to print every node exactly k edges from the root: recursive reduction and BFS level-tracking, with complexity analysis and placement context.

Quadratic Equation Roots in C, C++, Java, and Python

Algorithm, discriminant logic, and working code to find all roots of a quadratic equation in C, C++, Java, and Python, covering real, equal, and complex root cases.

Area of a Circle in C, C++, Java and Python

Step-by-step programs to find the area of a circle in C, C++, Java and Python, with sample output and common coding-round pitfalls.

Array Subset Check: 4 Methods in C++, Java, Python

Check if an array is a subset of another using four methods: two loops, binary search, sort-merge, and hashing. C++, Java, and Python code with time complexity.

Find Prime Numbers in a Given Range: C, C++, Java, and Python

Complete programs to find prime numbers in a given range in C, C++, Java, and Python. Covers trial division, sieve approach, and edge case analysis.

Find Repeating Elements in an Array: Three C++ Approaches

Three C++ methods to find duplicate elements in an array: brute-force O(n²), sorting O(n log n), and hashing O(n). Code, complexity table, and placement interview tips.

Find the First Non-Repeating Character in a String

Solve the first non-repeating character problem: O(n²) brute force and O(n) hash map with worked examples in Python, C, and Java.

Find the Largest Element in an Array Using Python

Four Python methods to find the largest element in an array: loop, max(), sorted(), and NumPy. Includes time complexity notes for campus placement coding rounds.

Count Ways to Reach a Score in a Game: DP Approach

Count unordered ways to reach a target score with DP. Verified recurrence, step-by-step trace, Python and C code, time and space complexity for placement rounds.

Decode Ways: Count All Decodings of a Digit Sequence

Count all valid letter strings a digit sequence can represent, using recursion, memoization, and dynamic programming, with worked examples and edge-case handling.

Find the Product of All Leaf Nodes in a Binary Tree

Step-by-step guide to finding the product of all leaf nodes in a binary tree using recursive DFS. Python, Java, and C++ code with O(n) complexity analysis.

Find the Smallest Element in a Python List

Find the smallest element in a Python list using a for loop or the built-in min(). Covers linear search algorithm, edge cases, and O(n) complexity.

Sum of All Odd Frequency Elements in an Array

Find the sum of elements with odd frequency in an array using hash maps. C++, Java, and Python code with worked example, trace, and O(n) complexity analysis.

Find the Sum of Natural Numbers With and Without Recursion

Formula, iterative, and recursive programs to find the sum of N natural numbers, with C and Python code, time-space trade-offs, and placement-test context.

Squaring Numbers Fast: Three Techniques for Aptitude Tests

Three techniques to square numbers mentally: the base method, ends-in-5 shortcut, and binomial expansion. Worked examples for TCS NQT and AMCAT.

Find the Second Smallest Element in an Array: 3 C++ Approaches

Three C++ methods to find the second smallest array element: sort, two-pass, and single-pass. Complexity table, edge cases, and placement interview tips.

For Loop in Python: Syntax, range(), and Worked Examples

Learn how Python's for loop iterates over lists, strings, and ranges. Covers range(), break, continue, nested loops, and placement coding patterns.

Fresher IT Jobs in Pune: Companies, Packages, and How to Apply (2026)

Pune has 500+ IT companies across Hinjewadi, Kharadi, and three other tech parks. Which ones hire freshers, what they pay, and how to clear the selection process.