Basic of Computer: Computers are now affecting every sphere of human activity and bringing about many changes in industry government education medicine scientific research la social sciences and even in arts like music and painting.They are presently used among other applications,to Design buildings,bridges and machines,Control space vehicles,Assit in railway reservation,Control inventories to minimize material cost, Grade examinations and process results,Aid in teaching,Systematically store and quickly retrieve data on land records,Play games like chess and vedio games.In a model of computer in which different units input unit take the data from the user and store in memory unit cpu unit is process the data and produce output to user.Computers features have to process instructions very simply and fastly add,subtract,read a character write a character compare numbers characters etc.Most of the instructions less than millionth of second.Instructions are carried out without any mistakes.Computer is solve the problems is analyzed.The method is used to solve the problems is broken down into a seqence of elementary tasks.The computer program fed to the computer.The computer processing unit interprets the instrucion in program,executes them and sends the results to output unit.Flowchart having obtained algorithm for soving the problem,we express the algorithm in a pictorial form called a flowchart.A program is to express the flowchart in a more precise and concise notation called a programming language.Working of computer will asuume that is first read by input unitr and stored in the computer's memory.The data process namely as set of papers each with aroll number and marks are queued up at the input unit in the order in which they would be used by the flowcharts.Storing program in memory also makes the operation of computer automatic.