代码实现
#include<stdio.h>
#include<stdlib.h>
int main()
{
int sz = 0;
int i = 0;
int j = 0;
int var = 0;
int arr[] = {2,3,4,5,6,7,8,8,7,6,5,4,3,2,21};
sz = sizeof(arr)/sizeof(arr[0]);
for(i = 0; i < sz ;i++ )
{
for(j = 0;j < sz ; j++)
{
if(i==j)
{
continue;
}
var = arr[i] ^ arr[j];
if(0==var)
{
break;
}
}
if(var != 0)
{
printf ("%d ",arr[i]);
break;
}
}
system("pause");
return 0;
}