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How to increase/ decrease a value by using the arrow keys.

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Emily Smith
Emily Smith 2016-10-19
关闭： Walter Roberson 2016-10-19
I have a numerical variable d=20 that i would like to be able to increase/decrease by ten each time i press the arrow key. So if i press the right arrow key once d=30, and if i press it again it would be d=40, and then if i press the left arrow key once it would be 30 again.

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