We build computer to solve Early computer solved mathematical and engineering problems，and later computers emphasized information processing for business T- oday，computers also control machines as diverse as automobile engines，robots，and microwave A computer system solves a problem from any of these domains by accepting input，processing it，and producing F 1-1 illustrates the function of a computer Computer systems consist of hardware and Hardware is the physical part of the Once designed，hardware is difficult and expensive to Software is the set of programs that instruct the hardware and is easier to modify than Computers are valuable because they are general-purpose machines that can solve many different kinds of problems，as opposed to special-purpose machines that can each solve only one kind of Different problems can be solved with the same hardware by supplying the system with a different set of hat is，with different undefined
