postfix increment operator with pointer, CH11, proj 11.4

[saturn-drm]

c-solutions/11/projects/04/4.c

Line 140 in f6206d2

if (num_in_rank[rank] == 2) *pairs++;

*pairs++; might be changed to (*pairs)++;.
Given postfix increment operators have higher precedence than indirection operators, the expression *pairs++; is equivalent to *(pairs++);, accessing the object stored in the next address in memory to pairs, which leads to the compiler issuing a warning "expression result unused", and to the program failing to recognize pairs in the example of "8c/as/7c/ad/3h".