C Program Examples — Learn C by Example

C Programs — Learn by Example

91 K&R solutions, sorting algorithms, strings, file I/O — every program compiles and runs.

K&R Solutions (91)
All Programs


K&R Exercises
Ch1–Ch7 · 91 programs

Algorithms
BFS · DFS · Sorting · Trees

String Programs
Anagram · Reverse · Palindrome

C Aptitude
Interview MCQs with answers

Sorting & Graph Algorithms

BFS in C

Breadth First Search · adjacency matrix · O(V²)

DFS in C

Depth First Search · recursive · stack-based

Merge Sort in C

Divide & conquer · O(n log n) · stable

Quick Sort in C

In-place · avg O(n log n) · pivot-based

Insertion Sort in C

Simple · O(n²) worst · O(n) best

Prim’s MST in C

Minimum Spanning Tree · greedy

K&R Exercise Solutions — All 91

Every exercise from The C Programming Language 2nd ed. (Kernighan & Ritchie) — compile-verified, with full explanation.

Chapter 1

12 exercises

Chapter 2

10 exercises

Chapter 3

6 exercises

Chapter 4

14 exercises

Chapter 5

20 exercises

Ch 6 & 7

17 exercises

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Pointers
Strings
File I/O
Sorting
Graph Algorithms
File Operations
Aptitude & MCQs
K&R Solutions

About this site: C programs written to the ANSI C89 standard — every program compiles with gcc -ansi -Wall -Wextra with zero warnings. Started in 2011 to work through K&R; grown to 380+ programs covering algorithms, data structures, string handling, and file I/O.