You're not a programmer are you? There's no such thing as bug-free code. Just like no writer can proof read his own novel, no programmer can truely find every bug in his own code.
It is a sad commentary on programmers as a group that statements like this are posted, and worse that they garner so much support from the chattering masses. Excellent programmers always strive to write code with few bugs; and sometimes they succeed. I personally wrote a package of high-precision arithmetic calculations that was used for many years by a prominent Wall Street firm, and am quite sure (for a variety of sound reasons, not just "belief") that this software (about 4,000 lines of C) is bug-free. For examples that are more publicly known, consider the 420,000 lines of code in the space shuttle, which had a total of 17 detected bugs in 11 major releases (see Good Question – How does NASA write perfect code for the space shuttle computers? by Marshall Brain, May 27, 2009); the whole system is not perfect, but major subsystems are.