An approachable, hands-on tutorial to writing a C compiler: a computer program that translates code written by the programmer into code the computer can understand. By building a compiler, readers will gain invaluable knowledge about how programming languages work; knowledge that will make them better programmers. Readers are gently led step-by-step to build a small working compiler and will develop throughout the book. Writing a C Compiler offers readers an accessible, practical approach to this complex and often overly theoretical topic.