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The unsigned keyword is a data type specifier, that makes a variable only represent non-negative integer numbers (positive numbers and zero). It can be applied only to the char, short,int, and long types. For example, if an int typically holds values from -32768 to 32767, an unsigned int will hold values from 0 to 65535. You can use this specifier when you know that your variable will never need to be negative. For example, if you declared a variable 'myHeight' to hold your height, you could make it unsigned because you know that you would never be negative inches tall.
Note: unsigned types use modular arithmetic. The default overflow behavior is to wrap around, instead of raising an exception or saturating. This can be useful, but can also be a source of bugs to the unwary.
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