Since the introduction of the PC's (Personal Computers) in the fall of 1981, computers have found their applications in all walks of life. At present they no more remain the tools of only scientists or engineers. They are being used to solve problems of varying complexities by every one. A problem could be as simple as ‘finding out the area of a triangle, given its three sides’ or ‘converting the temperature given in degrees Fahrenheit into temperature in degrees Celsius’. Also, a problem could be as complex as ‘controlling the trajectory of a missile’ or ‘in weather forecasting’. In any case, the digital computer does not figure out its own solution to problems, but must be told exactly how to solve any given problem as well as how to ...

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