By Michael A. Arbib (Auth.)
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8. Modular arithmetic: We said that a high-level language was one that made it easier to write programs. The reader will notice that in our wristwatch programs, we kept on using the idea of counting up to a certain number, after which we reset to 0. Mathematicians find this happens so often that they use the expression, for any number A with 0 ^ A < B, A + 1 MODULO B as shorthand for the number that is A + 1 unless A + 1 equals B, in which case the number is 0. For example, we count seconds MODULO 60.
Wet hair. Apply shampoo. Lather. Rinse. " Answer this question by analyzing a flow diagram for this program. 11. What do each of the following have in common with a program, as defined in this section, and how do they differ? (a) Cookbook recipe? (b) Table of contents? (c) Sergeant shouting "Hup, two, three, four, . . " to a private? (d) Rules of a solitaire game? 12. Set a book in front of you. Follow these two "progams," starting with a book in the same position each time. (a) Start; A; B; C; Stop (b) Start; C; A; B; Stop, where A means rotate the book 90° clockwise; B means keep what is now the left-hand edge of the book in place and flip the book over to the other side; and C means keep what is now the top edge of the book in place and flip the book over to the other side—as shown in the accompanying figure.
The tape into the correct pattern of electrical signals that will make the loudspeaker recreate the recorded sound. Sound is the medium of the main input to, and output from, a tape recorder. To complete our tour of Figure 2, though, we have to note another kind of input: control signals like PLAY, RECORD, REWIND, FAST FORWARD, and STOP. These control signals enable the user to decide just what the machine will record, what it will play back, and when it will do so. With the example of the tape recorder for comparison, we can now see how a computer is used in the interactive mode.
Computers and the Cybernetic Society by Michael A. Arbib (Auth.)