Your local variable mid
is declared in the scope that is closer to the point of use, so it “shadows” the mid()
function; the compiler thinks that you are trying to “call” an integer, which is invalid. Rename the local variable to fix this problem:
int midpoint; if (hi > lo) { int i = lo + 1; int j = hi; int p = mid(lo, hi); swap(vec[lo], vec[p]); midpoint = vec[lo]; ... }
Note: you could also use ::mid(lo, hi)
instead of renaming the variable, but that would confuse the readers of your program.
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