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TCS Coding Questions 2021: A Complete Guide with Solutions

TCS (Tata Consultancy Services) conducts the TCS NQT (National Qualifier Test) for hiring freshers. The coding section in 2021 was a critical part of the exam, testing problem-solving and logic building. This article covers the pattern, frequently asked questions, and detailed solutions.

2. Check if a number is a Kaprekar number (for a given base)

Example: 45 → 45² = 2025 → split 20 + 25 = 45 → Yes.
Concept: Square, convert to string, split, sum, compare. Tcs Coding Questions 2021

Sample TCS Coding Questions from 2021 (with logic)

Common Mistakes Observed in 2021

• Not reading the exact output format (extra spaces or newlines → test case fail).
• Using System.out.println() instead of System.out.print() when required.
• Modifying original array when not allowed.
• Assuming maximum input size – always write scalable code (O(n) preferred over O(n²) for large inputs).
• Forgetting to close scanner/files (not mandatory but good practice).

Topic-wise Analysis (2021 Trends)

The questions in 2021 largely focused on: TCS Coding Questions 2021: A Complete Guide with

1. Number Series: Finding the next term or printing a specific series pattern.
2. Number Systems: Armstrong numbers, Palindromes, Prime factors.
3. String Manipulation: Removing vowels, reversing strings, toggling cases.
4. General Logic: Discount calculations, Fare calculations, BMI logic.

4. Important Topics to Prepare

TCS 2021 questions largely focused on these algorithms. Master these patterns, and you can solve almost any variation: Not reading the exact output format (extra spaces

1. Number Series: Fibonacci, GCD, Factorial, finding if a number is part of a specific series (e.g., 3, 8, 15, 24...).
2. String Manipulation: Removing vowels, converting case, counting specific characters, checking palindromes.
3. 1D Arrays: Finding the maximum/minimum, sorting, reversing arrays.
4. Date/Time Logic: Calculating the number of days between two dates or finding the day of the week (rare but asked).
5. Number System: Decimal to Binary conversion, Prime checks, Armstrong numbers.

Strategy to Solve TCS Coding Questions

1. Understand input/output format – TCS iON is strict.
2. Write code in steps – First make it work for sample test case, then optimize.
3. Handle edge cases – empty array, single element, negative numbers.
4. Avoid complex libraries – standard libs allowed but avoid platform-specific issues.
5. Test with custom inputs – before final submit, run mental checks.
6. Time management – If 2 questions, solve easy one in 5–7 minutes, then medium.