Quiz: Arrays | Strings

Introduction

Quiz: Arrays | Strings checks how well you can apply Index of first and last element and Null terminator in strings (and related ideas) in C. Try each prompt in a scratch file before moving on.

Understanding the topic

Challenge 1 In your own words — or with a tiny program — show that you understand: Index of first and last element.

Challenge 2 In your own words — or with a tiny program — show that you understand: Null terminator in strings.

Challenge 3 In your own words — or with a tiny program — show that you understand: sizeof array vs pointer.

Challenge 4 In your own words — or with a tiny program — show that you understand: strcpy vs strncpy safety.

• Challenge 1 — In your own words — or with a tiny program — show that you understand: Index of first and last element.
• Challenge 2 — In your own words — or with a tiny program — show that you understand: Null terminator in strings.
• Challenge 3 — In your own words — or with a tiny program — show that you understand: sizeof array vs pointer.
• Challenge 4 — In your own words — or with a tiny program — show that you understand: strcpy vs strncpy safety.

Step-by-step explanation

1. Challenge 1 — In your own words — or with a tiny program — show that you understand: Index of first and last element.
2. Challenge 2 — In your own words — or with a tiny program — show that you understand: Null terminator in strings.
3. Challenge 3 — In your own words — or with a tiny program — show that you understand: sizeof array vs pointer.
4. Challenge 4 — In your own words — or with a tiny program — show that you understand: strcpy vs strncpy safety.

Execution workflow

Best practices

• Enable warnings: gcc -Wall -Wextra -std=c11 source.c -o app
• Give every variable a defined value before it is read.
• Stay inside array bounds — C will not stop you from over-running a buffer.

Common mistakes

• Reading uninitialized storage — behavior is undefined.
• Dismissing compiler warnings instead of fixing root causes.
• Ignoring NULL returns from malloc, fopen, and similar APIs.

Hands-on exercise

Practice problems:

• Build or explain: Index of first and last element
• Build or explain: Null terminator in strings
• Build or explain: sizeof array vs pointer
• Build or explain: strcpy vs strncpy safety

Summary

Quiz: Arrays | Strings in C — Self-check on indexing and C strings.