The fact that electronic comp uter are now used for data processing has led has led the general public to believe that it is a mysterious ,
complicated science and that the computer are machines that performs the function it is told to. If the input data are varied even a little ,
The computer is unable to operate until it is program med to accept the variation. The business operation it performs are impressive only because of the extremely high speed of manipulation ,but most of these operation have been used for decades . Unlike man, the computer performs repetitive calculations without getting tired or bored