C语言使用技巧（十七）：将未排序与排序后的两个数组中的元素再取并集和交集

两个排序数组的并集和交集，实现源码：

// C program to find union of 
// two sorted arrays 
#include <stdio.h> 
  
/* Function prints union of arr1[] and arr2[] 
   m is the number of elements in arr1[] 
   n is the number of elements in arr2[] */
int printUnion(int arr1[], int arr2[], i