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To calculate the check digit, take the remainder of (53 / 10), which is also known as (53 modulo 10), and if not 0, subtract from 10. Therefore, the check digit value is 7. i.e. (53 / 10) = 5 remainder 3; 10 - 3 = 7. Another example: to calculate the check digit for the following food item "01010101010x". Add the odd number digits: 0+0+0+0+0+0 = 0.
All two bit errors separated by a distance less than the order of the primitive polynomial which is a factor of the generator polynomial will be detected. The error polynomial in the two bit case is E ( x ) = x i + x k = x k ⋅ ( x i − k + 1 ) , i > k {\displaystyle E(x)=x^{i}+x^{k}=x^{k}\cdot (x^{i-k}+1),\;i>k} .
A method stub is a short and simple placeholder for a method that is not yet written for production needs. Generally, a method stub contains just enough code to allow it to be used – a declaration with any parameters, and if applicable, a return value.
The check bytes may be appended to the end of the data stream, with the c0 coming before the c1. uint16_t csum ; uint16_t c0 , c1 , f0 , f1 ; csum = Fletcher16 ( data , length ); f0 = csum & 0xff ; f1 = ( csum >> 8 ) & 0xff ; c0 = 0xff - (( f0 + f1 ) % 0xff ); c1 = 0xff - (( f0 + c0 ) % 0xff );