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01/10/11/12 and you read this as "This is card 1, and you add (01) the number on card 11 to the number on card 10 and write the result on card 12". This is fair enough. We think, though, that you would not start with 1. at the beginning and would rather keep the number on the card itself separate from the instruction. However, count full marks if this was your first choice, and Go to 45 12 from 48 A circle in a flow diagram represents a start or a stop. We shall not write the phrase "the contents of", but simply say ADD B to A and put the result in C ADO/A/B/C, or ADD AtoB and put the result in C ADD/B/A/C.
Turn to 28 25 from 22 No. You may not have known before that semaphore is a visual language, which has two signal arms (rather like those used on the railway) and these can take up many different positions, to represent letters of the alphabet. 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.
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. The numbers can be placed in, and taken out of, the arithmetic unit. The other registers contain the instructions which control the operations performed on the numbers. _l_L M Adder HSubtraclor A Divider A| | B| | C|_ ~] il 1 J| ΊΓ T Now we have our numbers in the registers, 8 in A, 12 in B, 40 in C, 15 in D and 5 in E.