DIGITAL COMPUTER
TODAY COMPUTERS ARE USED EXTENSIVELY IN
EVERY DAY LIFE. IT IS USED IN BASIC AS WELL AS INDUSTRIAL,
SCIENTIFIC AND COMMERCIAL PURPOSES. OUR SPACE PROGRAM WOULD NOT HAVE
BEEN WELL DEVELOPED WITHOUT THE REAL TIME MONITORING OF THE MACHINE OF THE
SPACECRAFT WHICH WAS GOING TO LAND ON MOON OR ANY OTHER PLANET OF THE SCHEDULED
PROGRAM OR LAUNCHING OF SATELLITES ON THE ORBIT OF EARTH. THIS IS THE
SCIENTIFIC PURPOSE I TOLD YOU ABOUT WHILE IT HAS COMMERCIAL
PURPOSES. LIKE AUTOMATIC DATA PROCESSING WHICH THE BUSINESS
ENTERPRISE USES.
IT HAS MANY WORKS IN EDUCATIONAL
PURPOSES FOR EXAMPLE MULTIPLE CHOICE QUESTION ANSWERS CAN BE CHECKED WITHOUT
ANY ERROR AND THEN THE RESULTS CAN BE PRINTED OUT AUTOMATICALLY WITH THE HELP
OF THE PRINTER WHICH IS CONNECTED TO THE DIGITAL COMPUTER. DIGITAL
COMPUTER ARE ALSO USED IN AIR TRAFFIC CONTROL TO CONTROL THE AVIATION INDUSTRY
TO HELP THEM CONTROL THE PLANES BY SENDING THEM DATA ABOUT THE DISTANCE BETWEEN
THE PLANES AND THE GROUND AS WELL AS ABOUT OTHER PLANES COMING THEIR
WAY. DIGITAL COMPUTERS ARE HEAVILY USED BECAUSE OF ITS SIMPLICITY
AND GENERALITY. GENERALITY BECAUSE IT TAKES DATA AS INPUT FOR
MANIPULATION OF INPUT TO GET A DESIRED OUTPUT. IN SIMPLE WORDS IT
CAN FOLLOW A SEQUENCE OF INSTRUCTION CALLED A PROGRAM THAT OPERATES ON A GIVEN
DATA, THEN THE PROGRAMMER CAN CHANGE THE PROGRAMS ACCORDING TO HIS NEED.
THE GENERAL PURPOSE DIGITAL COMPUTERS
IS BEST KNOWN EXAMPLE OF A DIGITAL SYSTEM. OTHER EXAMPLES INCLUDE
TELEPHONE SWITCHING EXCHANGES, DIGITAL VOLTMETER, FREQUENCY COUNTERS AND
CALCULATING MACHINES. I AM TELLING ABOUT THIS MACHINES BECAUSE THESE
MACHINES TAKE ABOUT INPUTS AND GIVE DESIRED OUTPUTS. THESE INPUTS
CAN BE SAID AS DISCRETE ELEMENTS BECAUSE MOST GENERALLY THERE ARE ELECTRICAL
SIGNALS, ELECTRICAL IMPULSES, FREQUENCY COUNTERS, DECIMAL DIGITS LETTERS OF AN
ALPHABET. CHARACTERISTICS OF DIGITAL SYSTEM IS MANIPULATION OF DISCRETE
ELEMENTS OF INFORMATION. SUCH ALPHABET, ARITHMETIC OPERATIONS PUNCTUATION
MARKS OR ANY OTHER SET OF MEANINGFUL SYMBOLS. THE JUXTAPOSITION OF
DISCRETE ELEMENTS OF INFORMATION REPRESENTS A QUANTITY OF INFORMATION.
FOR EXAMPLE THE WORD DOG IS FORMED BY LETTERS D , O, AND G. THE
LETTER 237 FORM THE NUMBER AND ETC. THUS A SEQUENCE OF THE LETTER FORM A
LANGUAGE THAT CONVEYS INFORMATION. EARLY THE COMPUTER WERE USED ONLY FOR
CALCULATION. FROM THIS CASE THE DISCRETE ELEMENT OF INFORMATION USED ARE
THE DIGITS. FROM THIS CAME THE WORD DIGITAL COMPUTERS.
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