Programming in C is designed to serve as a textbook for the undergraduate students of engineering, computer applications, and computer science for a basic course on C programming. Comprehensive in its coverage, the book focuses on the fundamentals to build a strong foundation of how to write effective C programs. The book starts with an introduction to C programming and then delves into an in-depth analysis of various constructs of C. The key topics include loops and decision-control statements, functions, arrays, strings, pointers, structures and unions, file management, and pre-processor directives. It deals separately with the fundamental concepts of various data structures such as linked lists, stacks and queues, trees, and graphs. The book provides numerous case studies linked to the concepts explained in the text. It also contains useful appendices including the ASCII chart, user-defined header files, introduction to the concept of sorting, pointer declarations, bit-fields and data structures, a list of C library functions, volatile and restrict type qualifiers, K&R C, introduction to algorithms, graphics and mouse programming. With its highly detailed pedagogy entailing examples, figures, algorithms, programming tips, keywords, and exercises, the book will serve as an ideal resource for students to master and fine-tune the art of writing efficient C programs.