"C" gives a group of numbers, only one number appears once, and all the other numbers appear in pairs. Find this number.

  to a group of numbers, only one number appears once, and all the other numbers are paired. Find out this number # include <stdio.h>int find_one (int arr[], int len) {int i = 0;int ret = 0;for (; i < Len; ++i) {ret ^= arr[i]; }return ret;} int main () {int arr[] = {1, 2, 3, 4, 1, 2, 3};p rintf ("%d\n", Find_one (arr, sizeof (arr)/sizeof (arr[0])); return 0;}

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"C" gives a group of numbers, only one number appears once, and all the other numbers appear in pairs. Find this number.