Learning to program a computer can be a very exhilarating experience. The thrill of seeing your first apparently complicated idea implemented in a simple program is wonderful. You will be well advised to look upon the computer as a machine to be mastered and not as some impersonal monster that is out to do you in. Everything that the computer does is explainable and predictable. You should take care to evaluate the results that the computer produces: do not blindly accept computer results as faultless. That is not to say that the computer is going to make many mistakes. In fact, under normal conditions, the computer will execute your instructions exactly. Mistakes in the results of a program execution are usually caused by errors in the instructions written by the programmer. Once in a great (and I mean great) while, the problem may be with the machine itself. Don't count on it, because it is most  unlikely. Machine error is absolutely the remotest possible cause of faulty program behavior: it almost never happens. Strongly resist the temptation to blame anything other than your programming for incorrect or unexpected results.