Issue regarding reduction declaration

[atoncetti]

https://github.com/madhug-nadig/Parallel-Processing-Nadig/blob/c52c90fc8e93d69dc88198a5948cdb88daac4141/Parallel%20Programming%20in%20C%20-%20Selection%20Sort.c#L17

Should be replaced with:

#pragma omp declare reduction(maximum : struct Compare : omp_out = omp_in.val > omp_out.val ? omp_in : omp_out) initializer(omp_priv=omp_orig)

otherwise the Compare struct members will be initialized to the default value (0) in the body of the for loop that uses the reduction (regardless of the fact that struct members have been initialized before the loop).