Technology & IT Skills

Blind C coding quiz: test your C programming skills

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This blind C coding quiz helps you build speed and accuracy with short, timed tasks without hints, covering syntax, control flow, pointers, and memory. After you finish, review skills with a C programming quiz, level up with a hands-on challenge to practice c code online, or target memory bugs with a C dynamic memory test.

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1On most 64-bit systems, what is the size of an int in C?
2Which header file declares the printf fun<wbr>ction?
3What is the correct signature for the entry point of a standard C program?
4Which keyword is used to declare a constant in C?
5Which operator represents logical AND in C?
6How do you start a multi-line comment in C?
7What is the default initial value of a static variable in C if not explicitly initialized?
8What is the result of the expression 5 / 2 in C when both operands are integers?
9Which declaration correctly defines an array of 10 integers?
10What is the value returned by sizeof(char) in C?
11Which of the following correctly demonstrates pointer arithmetic?
12Which symbol ends every statement in C?
13Where are global variables stored in memory on most systems?
14How many times will this loop execute? for(int i=0;i<5;i++){}
15What is the correct way to declare a pointer to a char?
16What is the result of ++i versus i++ in an expression?
17Which fun<wbr>ction is used to allocate dynamic memory in C?
18What must you do after calling malloc to avoid memory leaks?
19Which fun<wbr>ction correctly copies one C-string to another?
20How do you access a struct member in C through a pointer?
21What happens when you pass an array to a fun<wbr>ction in C?
22Which fun<wbr>ction opens a file for reading in C?
23What does NULL represent in C?
24Which operator compares for equality in C?
25What is a segmentation fault in C?
26What is the scope of a static local variable in C?
27What is the underlying type of an enum if not specified?
28What does the restrict keyword indicate in C99?
29Which fun<wbr>ction reads a line from stdin in C11?
30How do you declare a pointer to a pointer to int?
31What undefined behavior occurs when you call free() twice on the same pointer?
32Which fun<wbr>ction safely moves memory blocks that may overlap?
33What is the purpose of the volatile qualifier in C?
34How is alignment of a type queried in C11?
35What happens if you shift a 1-bit left by the width of the type?
36Which mechanism allows non-local jumps in C?
37What is type punning via a union used for?
38Which fun<wbr>ction returns the length of a null-terminated string?
39What is the difference between memcpy and memmove?
40What does the keyword restrict help the compiler optimize?
41Where are automatic variables typically allocated?
42What error does dereferencing a NULL pointer cause?
43How do you declare an array of fun<wbr>ction pointers returning int?
44What is undefined about modifying a variable twice between sequence points?
45Which preprocessor directive tests if a macro is defined?
46What feature does GCC's __attribute__((aligned)) provide?
47In which segment does dynamically loaded code reside?
48What does inline assembly with asm volatile do?
Learning Goals

Study Outcomes

  1. Write Code Without Prompts -

    Through blind coding challenges, you'll practice writing C code from memory, strengthening recall of key language constructs.

  2. Identify and Fix Syntax Errors -

    You'll learn to spot common C syntax mistakes under time pressure, improving your ability to debug code quickly.

  3. Implement Control Structures -

    You'll apply loops and conditional statements in a blind coding format, enhancing your mastery of control flow in C.

  4. Manage Memory with Pointers -

    You'll tackle pointer arithmetic and dynamic allocation tasks to reinforce best practices in memory management.

  5. Enhance Problem-Solving Speed -

    By working through fast-paced quiz questions, you'll accelerate your ability to devise efficient C solutions under constraints.

  6. Assess Your C Proficiency -

    Upon completion, you'll review performance metrics to identify strengths and pinpoint areas for further study.

Study Guide

Cheat Sheet

  1. Mastering C Syntax Essentials -

    Review data types, function prototypes, and header inclusion rules as defined by the ISO C standard (ISO/IEC 9899). Remember the K&R mnemonic "Type Name(Parameter List){…}" to recall proper function syntax. This foundation is crucial for any blind coding C challenge or C syntax test.

  2. Pointer and Memory Management Quiz Prep -

    Understand dynamic allocation via malloc/free and the importance of initializing pointers to prevent undefined behavior (per Stanford CS107). A handy trick is "Allocate, Use, Free" in that order to avoid leaks. These concepts are at the heart of any memory management quiz segment in a blind coding exercise.

  3. Efficient Control Structures -

    Practice if-else, switch-case, for, and while loops by tracing code on paper before typing to simulate blind coding conditions (source: Carnegie Mellon 15-111). Use the mnemonic "Loop, Control, Exit" as a mental checklist when running a control structures quiz. Mastery here speeds up writing logic without compiler feedback.

  4. Arrays and String Handling -

    Differentiate between char arrays and char pointers, keeping null-termination in mind (per The C Programming Language by Kernighan & Ritchie). A simple mnemonic "\0 marks the end, so index +1 for length" helps avoid buffer overruns. This knowledge shines in C programming quiz string puzzles.

  5. Debugging and Best Practices -

    In blind coding environments, anticipate common pitfalls by checking return values and using assertions (as recommended by the GNU and Linux Documentation Project). Employ a systematic "Check, Debug, Refine" approach and mentally simulate Valgrind error detection if actual tools aren't available. This strategy boosts confidence in any C programming quiz scenario.

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Updated Feb 24, 2026