Arithmetic of Computers

Arithmetic of Computers

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Lesson 7

Decimals to Octals

. . . and back again

Page 249

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Your answer :
I don’t understand this.
We hadn’t explained why this method works; we were just trying to explain how it works. We’ll go through this example. First you divide 39110 by 8 and obtain a quotient and a remainder:
quotient remainder 48 ,  r =  7 8)391
That is, 8 “goes into” 391 48 times, leaving a remainder of 7. Now you divide this first quotient, 48 by 8:
6 ,  r = 0 8)48 ,  r = 7 8)391
This time the division comes out even; so the remainder is 0. Now you divide the new quotient, 6, by 8. This time you get a quotient of 0, of course, and a remainder of 6.
0 ,  r = 6 8)6 ,  r = 0 8)48 ,  r = 7 8)391
And now you use the remainders for the digits of the octal number:
3rd remainder →  6078  ← 1st remainder 2nd remainder
Convert 2, 13210 into an octal number.
Answer :
2, 13210 = 4, 1248.

Go to Page 224

2, 13210 = 4, 2148.

Go to Page 232

2, 13210 = 4, 4248.

Go to Page 238


Answer to Self-Test Question 4, Lesson 7 :
a. 6478; b. 7648; c. 64058.

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