An Introduction to Digital Computing by F. H. George (Auth.)

By F. H. George (Auth.)

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Twelve. 64. Eleven. 12 from 55/59 The correct answer is "true". If a computer is automatic, then it must have a store. A desk calculator may be said to store numbers, but it normally only does so for a very short time. A computer stores both numbers and instructions, for any length of time. Now, do we have to place both the instructions and the numbers in store before the computer operates?

The fact that it has two arms, both of which may take up many positions, ensures that it is not binary. If it had only two positions, as in fact a railway signal has, then it certainly would be in binary code. Turn to 27 26 from 29 You could have Morse code with only dots. But you might agree that the pause is also a symbol so you really need two symbols at least, for any language. This is really a matter of how you wish to use the word "symbol". ) Go to 32 27 from 25 Remember Morse code is a code which uses dots and dashes, and therefore seems like a binary code.

01/10/11/12. 49. 01/10/11/12. 51. 1. 01. 43 from 45 No. 8 + 12 = 20 20 + 40 = 60 60 - 15 = 45 45 ■+- 5 = 9 You probably made your mistake on the last step and said 45 - 5 = 40. Turn to 47 12 from 47 [(8 + 12) +40] - 15 5 It is easy to see the correct sequence of operation: (1) (2) (3) (4) 8 + 12 20 + 40 60 - 15 45 -*- 5 = = = 20 60 45 9 Then the computer can be made to print out the answer 9, but leave that for now. Write down next the computer instructions of our problem (not in coded form, but ordinary language).

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