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Editing User:BaronW
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Subtraction engine.<br /> | Subtraction engine.<br /> | ||
[[File:Subtraction main.PNG]]<br /> | [[File:Subtraction main.PNG]]<br /> | ||
− | The one difficulty in subtraction is that the engine has no idea what a negative number is, so if you want the calculator to be able to give a negative response you need to teach it. My solution ( | + | The one difficulty in subtraction is that the engine has no idea what a negative number is, so if you want the calculator to be able to give a negative response you need to teach it. My solution (possibly massively overcomplicated) was to build a which number is larger engine and then tell the subtraction engine to subtract the smaller number from the larger. A 'which number is larger' engine is not easy. It is presented with 2 10 digit binary numbers A1-A10 & B1-B10 then asks: does 'A1=1 and B1=0' or does 'B1=1 n and A1=0' if the answer is yes to either, that will mean that one number is larger than the other. It will then send power to a set of screw-pumps that will then tell the main engine which number to subtract from which. If the answer is no to both then it will ask does 'A2=1 and B2=0' or does 'B2=1 n and A2=0', this repeats until it decided which number is larger or that they are the same.<br /> |
+ | The engine looks like this- the main bit is in the bottom right.<br /> | ||
[[File:Which number is larger.PNG]] | [[File:Which number is larger.PNG]] | ||