Placement preparation

31 Most-Asked C Programming Interview Questions (with Code)

The 31 C programs that appear most in product-company and service-company technical rounds, with verified code and recruiter-level explanations.

7 May 2026 · 10 min read

Alligation and Mixture: Speed Tricks for Aptitude Tests

Six speed tricks for alligation problems: recognise the pattern in 30 seconds, dodge the common time-traps, and set your test-day attack order.

AMCAT Syllabus and Exam Pattern 2026: All Sections Explained

AMCAT 2026: three compulsory aptitude sections, a personality inventory, specialist sub-tests (SVAR, Automata), domain electives, and how scores work.

AMCAT vs eLitmus pH Test: Format, Sections, Scoring and Fees

AMCAT vs eLitmus pH test: format, sections, negative marking, score validity and fees compared side by side for freshers deciding which to take.

Arranging Flower Sticks in a Bouquet: Sorting Problem

Solve the flower sticks bouquet problem with Python, C++, and Java. Covers split-sort algorithm, step-by-step walkthrough, complexity analysis, and edge cases.

C Coding Questions: Practice Set 1 for Placement Prep

10 C MCQs covering pointer passing, double pointers, structures, strings, and memory allocation with full explanations and a corrected code trace.

Calculator Program in Python: Two Methods Explained

Build a simple calculator in Python using an if-elif chain and a function-based design. Covers the divide-by-zero edge case that placement coders get wrong.

Check Whether a Given Number Is a Perfect Number

Step-by-step guide to checking perfect numbers with brute-force O(N) and optimised O(√N) algorithms. Full programs in C, Python, and Java with verified examples.

Check If a Number Is Sum of Two Primes (C, C++, Java, Python)

Step-by-step guide to checking if N = p+q where p and q are both prime. Trial division and Sieve approaches with code in C, C++, Java, and Python.

Check Whether a String Is a Palindrome

Three approaches to check if a string is a palindrome: two-pointer O(n), reverse-and-compare, and recursive. Code in C, C++, Java, and Python with edge cases.

Comparison Errors in Sentence Correction: Types and Fixes

Five comparison error types tested in placement verbal sections, each with worked examples: incomplete, illogical, wrong than/as, wrong form, and non-parallel structure.

Data Interpretation Concepts and Worked Examples

Worked examples for every DI type in campus aptitude rounds: pie charts, bar graphs, line graphs, tables, and text-based caselets, with full step-by-step solutions.

Elements of Triangles: Types, Theorems, and Formulas

Triangle types, angle sum property, exterior angle theorem, Pythagoras, Heron's formula, special triangles, and congruence rules with worked examples for aptitude.

eLitmus Exam Pattern: Sections, Syllabus and Scoring Explained

The eLitmus pH test: 60 questions, three sections, 150 minutes. Section-wise syllabus, IRT scoring model, and negative marking explained for freshers in 2026.

eLitmus Sample Papers 2026: Quant, LR & Verbal Questions Solved

Practice for the eLitmus pH Test with solved sample questions across Quantitative Ability, Problem Solving and Verbal Ability. Updated for 2026.

7 May 2026 · 11 min read

Encrypt a Secret Code with Two Key Values: C++ and Python

Encrypt a secret code S using key values N and M via last-digit cycles and modular exponentiation. C++ and Python code, worked examples, and an edge-case fix.

Fibonacci Series up to N Value in C, C++, Java and Python

Print all Fibonacci numbers ≤ n using iterative, recursive, and memoization approaches. Full working code in C, C++, Java, and Python.

Find the Equilibrium Index of an Array

Step-by-step guide to finding the equilibrium index of an array using O(n²) and O(n) prefix-sum methods, with working code in C, C++, Python, and Java.

Noddy's Largest House: Solving the Max-Gap Problem

Solve the Noddy house-numbers problem: sort houses by position, scan for the largest gap, return the flanking pair. Worked example and Python code.

Finding Square Roots and Cube Roots: Quick Methods for Aptitude

Master the last-digit trick, Babylonian method, and prime factorisation for square and cube roots, with 10 worked placement examples.

Fresher IT Jobs in Bangalore: Clusters, Companies and CTC Bands (2026)

Bangalore holds India's largest IT workforce. This 2026 guide covers five hiring clusters, top recruiters, CTC bands, and application paths for freshers.

Fresher IT Jobs in Chennai: Roles, Companies, and Where to Apply

Chennai's OMR belt concentrates most South India IT fresher hiring. Here are the active 2026 roles, companies, and application routes for engineering graduates.

IT Jobs in Hyderabad for Freshers: 2026 Salary and Skills Guide

Hyderabad hosts 355+ GCCs and every major IT services firm. Here's what freshers earn, which roles are open, and what interviewers test in 2026.

Generate Binary Numbers from 1 to N: 3 Python and C++ Methods

Three methods to generate binary numbers from 1 to N: queue BFS, bit-shift loop, and Python built-ins. Code with trace examples and a complexity table.

Greatest of Three Numbers in Python: 3 Methods

Three Python methods to find the greatest of three numbers: if-else comparison, built-in max(), and a custom function. Sample runs and edge-case handling included.

Half Pyramid Pattern in Python: 5 Variants with Code

Learn five half pyramid patterns in Python with asterisks, same numbers, incrementing, decrementing, and alphabets. Each variant includes code and verified output.

5 Critical Reasoning Question Types: How to Approach Each

Assumption, inference, strengthen/weaken, paradox, and logical flaw questions explained with worked examples and a per-type approach for placement aptitude tests.

How to Find the Unit Digit of a Number: Step-by-Step

Solve unit digit problems in aptitude tests using cyclicity tables for digits 2–9. Covers products, powers, and the mod-4 method with worked examples.

Calendar Problems in Aptitude Tests: Derive, Don't Memorise

Learn the odd-days method for calendar aptitude questions, re-derive the century table from first principles, and work through 6 verified examples.

Verbal Ability for Placements: The Complete Prep Guide

Master reading comprehension, sentence correction, para-jumbles, and vocabulary for campus placement tests. Includes a 4-week study plan and test-specific topic maps.

How to Solve Percentage Problems in Aptitude Tests

Master the key percentage shortcuts for campus placement tests: the a%-of-b swap, successive-change formula, election problems, and fully worked examples.

Sentence Correction: 7 Common Error Types and Fix Rules

Seven error types cover most sentence correction questions in placement tests. Includes worked examples and a fix rule for each type.

Ratio and Proportion: Formulas, Tricks, and Worked Examples

Ratio and proportion for placement aptitude: formulas, componendo-dividendo, continued proportion, and 7 step-by-step worked examples across problem types.

LCM of Two Numbers in Python: 3 Methods Explained

Three Python methods to compute LCM: brute-force loop, GCD formula (Euclidean algorithm), and the math.lcm builtin (Python 3.9+). Worked examples and N-number extension.

Simple and Compound Interest: Formulas, Examples and Shortcuts

Worked examples for SI=PRT/100, CI=P(1+R/100)^T, half-yearly and quarterly compounding, and the CI-SI difference shortcut used in campus placement aptitude tests.

Matrix Addition in Python: Step-by-Step with Code Examples

Four approaches to matrix addition in Python: nested loops, list comprehension, zip, and NumPy. Includes dimension validation and traced outputs.

Arrangement Puzzles: Types, Strategy, and Worked Examples

Learn to solve linear, circular, and complex arrangement puzzles with a step-by-step strategy and verified examples for placement aptitude tests.

Percentage Formulas: 5 Core Concepts with Worked Examples

Master the 5 core percentage formulas for placement aptitude tests, with step-by-step worked examples on salary hikes, P&L, successive change, and exam scores.

Time, Speed and Distance: Formulas, Shortcuts and Worked Problems

Every TSD formula for placement aptitude tests: average speed, relative speed, trains, boats and streams, with step-by-step verified examples.

Misplaced Modifiers in Sentence Correction: A Deep Dive

Fix misplaced, dangling, squinting, and limiting modifiers in sentence correction. Placement-ready rules, worked examples, and practice questions.

Mixtures and Alligations: Complete Aptitude Guide

Master the alligation rule, simple replacement, and the repeated-replacement formula with 9 verified worked examples for placement aptitude tests.

Most Asked Java Interview Questions, Set 1

Core Java interview questions for freshers: JDK vs JRE, == vs .equals(), overloading vs overriding, abstract class vs interface, exception handling, and collections.

Most Commonly Asked Java Interview Questions

Java interview questions freshers face most: OOP, collections, exception handling, JVM memory, and threading, with verified code examples and concise answers.

Multiplying Any Number by 111: The Shift-and-Add Trick

Multiply any number by 111 using the shift-and-add method. Full derivation, carry examples including 786 × 111 = 87,246, and practice problems for placement aptitude.

Must-Know Technical Interview Questions for CSE/IT Freshers

The 18 most common technical interview questions across DSA, operating systems, databases, OOP, and networking, with concise answers for campus placement.

C Programming Questions: Must-Solve List for Beginners

Must-solve C programming questions for beginners, covering control flow, recursion, strings, arrays, and matrix operations with working code examples.