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In computer science, an input variable is the input from the user. To read an input, there must be a scanner. The scanner will state what type of value, or variable, that the user must put in to proceed. Such variables include int, double, String, etc. The program can then use the value to perform calculaltions. For example, a program that adds two numbers together may ask the user to input the two numbers and it will return the sum. The scanner method will make sure that the user inputs a numerical variable such as an int or double, rather than a String.

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Q: What does input variable mean?
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What are increasing marginal returns?

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