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So, an integer variable is a scalar value. This means that you can have any integer inside of it that you want. Scalar generally means one-dimensional, so it can be any number on that dimension, like the number line.
Lenght is scalar quantity. Scalar involves only magnitude while vector involves magnitude in a certain direction. That's why there can be negative velocity, displacement and acceleration but no negative length. When it is negative it means the magnitude of the quantity is in the opposite direction.