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Key trapping in c++

I m able to trap ascii code of most of the keys on keyboard. Pls tell me how 2 get ascii code of space ,backspace and enter keys in c++.
Would b grateful if u provide me with actual code for it.

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How to get the sterling pound symbol in K120 logitech keyboard


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How do you set margins


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If the carrier stops before you get to where you want to set the margin, then locate the ALT key at the bottom left on the keyboard, hold it down, then locate the key directly under the words above the keyboard that say M REL (the 3 key) and push it. Then move the carrier with the space bar or backspace key. (whichever direction you want to go)
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Margins


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The margin keys are on the left side of the keyboard.


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