#include<stdio.h>
int main()
{
    int duichen(int data[],int length);
    int a[4]={1,2,2,1};
    duichen(a,4);
    return 0;
}
int duichen( int data[],int length)//函数的作用是判断数组是否对称
{         
         int i=0;
         int m,j;
         if(length/2!=0)//当length为奇数时
             printf("不对称!\n");
          else
          {
              m=length/2;
              for(i=0;i<m;i++)
              for(j=length-1;j>=m;j--)
              {
                  if(data[i]==data[j] && length/2==0 )
                      continue;
              }
                  printf("是对称的!\n");
            
          }
                  return 0;
          }