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Use unsigned variables

When declaring a numeric variable in C, you can use 'signed' or 'unsigned'. Variable is signed unless you specifically type unsigned before the variable type: unsigned int sh = 26; The standard int variable can hold values from -32,768 up to 32,767. That's half negative numbers, from -32,786 to -1, and then half positive numbers, from 0 up to 32,767. An unsigned number means that the variable holds only positive values. Your typical unsigned int has a range from 0 to 65,535.