C – Index

Welcome to the complete C resource centre. Refresh the essentials first, then grind the placement tracks.

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Revision Guide

Interview-focused revision of everything you need — from pointers to undefined behaviour.

• Part 1: Pointers, Arrays & Memory Memory model, pointer arithmetic, arrays, malloc/free, and double pointers.
• Part 2: Strings, Storage & Scope Char arrays vs literals, string functions, storage classes, and lifetimes.
• Part 3: Structs, Unions, Preprocessor & Operators Packing, unions, macros, bitwise operators, and operator precedence.
• Part 4: Control Flow, Stdlib, Undefined Behaviour & Gotchas I/O, recursion, UB, and the gotcha sheet.

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Top 10 Questions

• Top 10 C Questions - Part 1 The 10 most frequently asked C placement questions.

Top 25 Questions

• Top 25 - Part 1 First 15 of the top 25 C placement questions.
• Top 25 - Part 2 Remaining 10 of the top 25 C questions.

Top 50 Questions

• Top 50 - Part 1 First 15 of the most asked C questions.
• Top 50 - Part 2 Middle 15 of the top 50 C questions.
• Top 50 - Part 3 Final 20 advanced C questions.

Output Questions

• Output Questions - Part 1 sizeof, division, pointers, and switch output puzzles.
• Output Questions - Part 2 Precedence, unsigned arithmetic, recursion, and memory.

Comparison Questions

• Comparison Questions - Part 1 ==, relational, signed/unsigned, and character comparison.
• Comparison Questions - Part 2 Structs, enums, pointers, and tricky unsigned comparisons.

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Section-wise Q&A

• 1. Pointers & Memory Pointers, memory layout, and pointer arithmetic.
• 2. Strings String handling, functions, and literals.
• 3. Storage Classes & Scope auto, register, static, extern, and lifetimes.
• 4. Preprocessor & Macros Defines, macros, and tokens.
• 5. Structs, Unions & Undefined Behavior Packed structs, unions, and UB.
• 6. Operators, Stdlib & I/O Bitwise ops, library functions, and printf.