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The absolute value of the integer 21 is 21. The absolute value of something is its distance from 0.
0 - 65535
The range for signed numbers is -128 to +127. The range for signed numbers is 0 to 255.
It means the absolute value of the integer, or its distance from 0. Since a distance cannot be negative, the absolute value is always positive.
The integer written without a positive or negative sign.