Placement preparation
Aptitude, coding, verbal ability, and reasoning, broken down with worked examples for Indian engineering placements. 539 articles.
Types of Numbers for Aptitude Tests: A 2026 Guide
Natural, whole, rational, prime, and recurring numbers explained with worked examples. Know which number types appear most in campus placement aptitude papers.
Variables and Keywords in C: A Complete Reference
Learn the rules for naming variables in C, all 32 reserved keywords by category, storage classes, scope, and the interview traps that trip up placement candidates.
Why Companies Prefer Full Stack Developers in 2026
Full-stack developers cover both frontend and backend. Here's why Indian tech companies prefer them and how to build a profile that clears the filter.
Taking Career Risks: A Framework for Engineering Students
A decision framework for engineering students weighing off-campus roles, startup offers, and stream switches, with two tests to bound your downside.
Area of Circle in Python: Program Guide with math.pi
Three Python programs to calculate circle area: hardcoded π, math.pi, and numpy.pi. Covers input handling, edge cases, and verified outputs for r=5.
Armstrong Number in Python: 3 Easy Programs
Python programs to check Armstrong numbers: while loop, list comprehension, and a range finder. Verified digit-power derivations for 153, 370, 371, 407, and 9474.
Assignment Operators in Python: Complete Guide with Examples
All 8 Python assignment operators with code examples: = and the 7 augmented forms (+=, -=, *=, /=, %=, **=, //=), walrus :=, and placement test traps.
Python Logical Operators: and, or, not With Examples
Python's and, or, not keywords evaluate conditions, short-circuit expressions, and power the default-value idiom. Truthy/falsy, bitwise differences, and common bugs.
Check if Two Arrays Are Disjoint: C, C++, Java and Python
Four approaches to check if two arrays share no common elements: nested loops O(m×n), sort plus two-pointer, and hash set O(m+n), with C, C++, Java, and Python code.
Commonly Asked C Technical Interview Questions (with Answers)
The seven concept areas C interviewers test most: pointers, memory, strings, storage classes, preprocessor, structs, and undefined behavior, with worked examples.
Quadrilaterals: Types, Properties and Formulas
Six quadrilateral types: square, rectangle, parallelogram, rhombus, trapezium, and kite. Properties, area formulas, and worked examples for campus placement tests.
Count the Number of Ways to Reach the Nth Stair
Staircase problem solved four ways: naive recursion, memoized DP, tabulation, and O(1) space. Python code, verified Fibonacci values, and k-step variation.
Critical Reasoning for Placement Tests: A Beginner's Guide
Six question types, a 3-step approach, and four worked examples for critical reasoning in TCS NQT, AMCAT, CAT, and eLitmus.
Critical Reasoning Question Types for Placement Tests
Master the 6 critical reasoning question types tested in AMCAT, eLitmus, CoCubes, and company-specific placement tests, with worked examples and common traps.
Python Decorators: @syntax, functools.wraps, and Practical Examples
Learn Python decorators step by step: @decorator syntax, functools.wraps, parametrized decorators, class-based decorators, and placement interview examples.
eLitmus pH Test 2026: Exam Pattern, Negative Marking and Percentile
The eLitmus pH test: 60 questions across three sections in two hours. Negative marking rules, percentile calculation, and prep guide for 2026.
Modular Exponentiation in Python: pow(b, e, n) Explained
Compute b^e mod n without overflow using Python's three-argument pow(b, e, n) or the square-and-multiply algorithm. Worked example included.
Find All Ancestors of a Node in a Binary Tree
Find all ancestors of a node in a binary tree with recursive and iterative Python solutions. Includes complexity analysis and placement interview patterns.
Squares Near 10, 100 and 1000: The Base-Distance Trick
Square any number near 10, 100, or 1000 in two steps using (a+b)(a-b). Full derivations for 9², 98², 997², 1002², and placement practice problems.
Min and Max of Arithmetic Expression with + and * (Interval DP)
Find the minimum and maximum of a + and * expression by placing parentheses, using interval DP with a step-by-step worked example.
Shortest Path Between Two Vertices in an Undirected Graph
BFS-based shortest path in undirected graphs: adjacency-list representation, parent-tracking, path reconstruction, and Python + C++ code.
Squaring 2-Digit Numbers Ending in 1, 4, 5, and 6
Four shortcuts for squaring 2-digit numbers ending in 1, 4, 5, or 6, with worked examples, algebraic proof, and a reference table for placement aptitude.
Check if a Character is a Vowel or Consonant in C
Three C programs classify any character as a vowel, consonant, or non-alphabet input using if-else with tolower(), switch-case, and a strchr() lookup table.
Stress Interviews: Common Questions and How to Handle Them
A stress interview tests composure and clear thinking under pressure. Here's what to expect, which questions come up most often, and how to answer them.
Communication Skills for Campus Placements: GD, HR, and Beyond
GD rounds, HR interviews, and written assessments each test communication differently. Here's what engineering students need to practise and how.
Print All Distinct Elements in an Array in C
Three C programs to print all distinct elements in an array: nested-loop O(N²), sorting, and count-array, with complexity trade-offs and placement interview tips.
Technical Round Self-Study System: 2026 Engineer's Guide
A practical guide for building a self-study technical-round prep system covering DSA, OS, CN, DBMS, and programming: free and low-cost resources included.
Python Conditionals: if, if-else, elif, and Nested if Explained
Python's if, if-else, elif, and nested if statements control program flow. Syntax, worked examples, and truthiness edge cases for 0, '', [], and None.
4 Methods to Solve Linear Equations (With Worked Examples)
Substitution, elimination, cross-multiplication, and Cramer's rule explained with verified worked examples and placement-test strategy for engineering students.
C Command Line Arguments Set 2: 5 Placement Programs
Five C programs using argc/argv for placement interviews: sum of CLI args, even/odd count, string reverse, safe atoi parsing, and multi-arg processing.
Multithreading in Python: threading Module Complete Guide
Python multithreading with the threading module: create threads, use Lock, RLock, and Semaphore, understand the GIL, and pick the right concurrency tool.
Optimise Your LinkedIn Profile: Advanced 2026 Guide
Already have a LinkedIn profile? This advanced playbook covers SSI score, Boolean keyword placement, Creator mode, and ABM DM templates to drive recruiter inbound.
How to Prep for Product, Service, Analytics, and AI-First Companies
Product, service, analytics, and AI-first companies test very different skills. This guide maps what each bucket tests and how to split your prep time.
Probability Concepts and Problems for Aptitude Tests
How probability thinking works: sample space construction, addition and multiplication rules, conditional probability, and worked problems for placement aptitude tests.
Strong Number Program: Check in C, Python, and Java
Understand strong numbers (Krishnamurthy numbers), verify 145 and 40585 step by step, and write clean check programs in C, Python, and Java.
Check if a Graph is a Tree: Three Algorithms in Python
Three algorithms to check if an undirected graph is a tree: DFS with parent tracking, Union-Find, and edge-count plus BFS. Python code for each, O(V+E) analysis.
Count Common Subsequences of Two Strings
Count common subsequences of two strings using DP: derive the recurrence, trace a 4x4 table, implement in Python, and cut space to O(min(m,n)) with a rolling array.
Minimum Number of Jumps to Reach End of an Array
Greedy O(n) and DP O(n²) solutions for the minimum jumps problem, with worked examples verified from scratch and C, Python, Java programs.
Matrix Row and Column Sums: Find the Greatest
Find the sum of each row and column of a matrix, then identify which row and column has the greatest sum. Algorithm, C, Java, Python code, complexity.
Frequency of Each Array Element: 3 Approaches
Count how often each element appears in an array using nested loops, sorted sweep, and hash map. Python and C++ code with complexity analysis and edge cases.
Find Greatest of Two or Three Numbers: C, Python, and Java
If-else, ternary, and built-in approaches to finding the max of 2 or 3 numbers in C, Python, and Java, with N-numbers loop and edge cases.
Kth Maximum Element in a Binary Search Tree
Reverse inorder traversal finds the k-th maximum in a BST in O(H+k) time. Worked example with a 7-node tree, C++, Java, and Python code, plus edge cases.
Median of Two Sorted Arrays: Brute Force and Binary Search
Find the median of two sorted arrays using the merge approach and the O(log min(m,n)) binary search partition. Verified Python code included.
Saddle Point of a Matrix: C, C++, Java, and Python Programs
A saddle point is the minimum in its row and the maximum in its column. Learn the O(M×N) two-pass algorithm with working code in C, C++, Java, and Python.
Sum of Numbers in a Range: Naïve, Formula, Prefix Array
Three approaches to the range sum problem: O(n) loop, Gauss O(1) closed-form, and prefix-sum array for repeated queries. Verified examples in C, Java, and Python.
Program to Remove Spaces from a String: Python & C
Remove all whitespace from a string in Python and C: two-pointer, build-new-string, and library one-liners, with complexity analysis and edge cases.
Reverse Every Word in a Sentence: C, Java, Python
Two-pointer algorithm and code in C, Java, and Python to reverse every individual word in a sentence while keeping word order unchanged.
Python Command Line Arguments: sys.argv and argparse
Learn to read Python command line arguments with sys.argv and argparse. Covers basic usage, named flags, type conversion, and practical script patterns.
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2026 placement-drive AI patterns, project picks recruiters credit, and a prep timeline that fits beside aptitude and coding work.
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