New PDF release: Computers and the Cybernetic Society

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3). The flow diagram for Stage 3 (Fig. 4) is almost the same as Figure 2 for Stage 1. To carry out this part of the program, the computer must get ' y Figure 2 Advance one step » s' " ^ \ Touchinq wall? " signals from a device on the side of the robot that tells whether or not it is touching the wall at its side. " shows that the robot has achieved its goal of reaching the doorway, and so is no longer touching the wall. At this stage, the computer is instructed to exit from the program. It then awaits further instructions or goes on to obey the instructions of the next program already stored in its memory.

Let us consider the design of a twenty-four-hour watch that shows 00:00:00 at midnight, 12:00:00 at noon, and 23:59:59 one second before midnight. The display has three parts—the hour, which can run from 00 to 23, and the minute and the second, each of which runs from 00 to 59. The circuitry inside the watch includes three registers—electronic devices that store the electronic representation of these numbers. Let us call the registers HOUR, MINUTE, and SECOND, respectively. We use the notation (HOUR) = 13 to indicate that the number currently stored in the HOUR 28 ABOUT COMPUTERS AND PROGRAMS register is 13.

L. Basic, 2nd ed. New York: Academic Press, 1982. L. Pascal. New York: Academic Press, 1982. , and D. Haden. Social Effects of Computer Use and Misuse. New York: John Wiley and Sons, 1976. O. Computers and Their Societal Impact. New York: John Wiley and Sons, 1977. Sanders, D. Computers in Society. New York: McGraw-Hill, 1977. K. Slotnick. Computers, Their Structure, Use, and Influence. Englewood Cliffs, New Jersey: Prentice-Hall, 1979. 1, we learned that a computer is a machine that can store a program and data and then automatically execute the instructions with electronic speed.

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