A Commandment for C Programmers Posted on January 30, 2015January 30, 2007 by admin 4. If thy header files fail to declare the return types of thy library functions, thou shalt declare them thyself with the most meticulous care, lest grievous harm befall thy program. Spread the love Related posts: Dr. Suess Logs On The Perfect Match Jesus and Mohammed and the Compitition Advertisements