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if(index <= (int)(TOTAL_ELEMENTS - 2))
#include <stdio.h>
#define TOTAL_ELEMENTS (sizeof(array)/sizeof(array[0]))
int main()
{
int array[] = {2,4,7,9,11,8,5,6};
int tmp,index = -1;
tmp = TOTAL_ELEMENTS - 2;
if(index <= tmp)
tmp = array[index + 1];
printf("数据:%d\n",tmp);
return 0;
}