By F. H. George (Auth.)
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This has to be read by a sensing device in the computer, much as a blind man reads braille. Now to learn more about these points go to 41 and begin Chapter Two. 12 from 41 Remember, we can think of storing our computer words (of two kinds) in our file, and this is our storage. It could be a box full of cards, but because it is electronic, it happens to be in the form of electrical pulses, and magnetized spots on magnetic drums, magnetic tape or magnetic discs. But you can think of it, for all practical purposes, as a set of cards in a file.
9. 12 from 44 Now the instructions are : 1. ADD contents of B to contents of A and place the answer in A. ) 2. Now ADD contents of C to contents of A, and place answer in A again. 3. Now SUBTRACT contents of D from contents of A, and place answer in A. 4. Now DIVIDE contents of A by contents of E, and place the answer in A. 5. PRINT out the contents of A. ) Proceed to 48 12 from 43/45 9 is the correct answer. Now imagine the following simple computer having storage registers with addresses A, B, C, D and E for numbers.
Could you communicate a message by using only one symbol ? Turn to 26 12 from 28/34 Two is correct. We only need to add, but we need to add twice. So we say ADD 1 to 2 and then ADD (the result of adding 1 to 2) to 3. Now remember that address A contains the number 1, address B the number 2 and address C the number 3. Let us store the result of the first addition in the store with address D and the final result in the store with address E. Now that we have allocated all the stores that we need for our numbers, code the two ADD instructions in the form that we have already used.