Function swap

CPP/sorting/shellsort.cpp:5–9

#include<stdlib.h>

void swap(int * x, int * y) {
  int temp = * x;
  * x = * y;
  * y = temp;
}
void ShellSort(int A[], int n) {
  int gap, i, j, temp;
  for (gap = n / 2; gap >= 1; gap /= 2) {