int data[4],length;
length=sizeof(data)/sizeof(data[0]); //数组占内存总空间除以单个元素占内存空间大小，即等于元素个数printf("length of data[4]=%d", length ); //输出length of data[4]=4int data[4],length;
length=sizeof(data)/sizeof(data[0]); //数组占内存总空间除以单个元素占内存空间大小，即等于元素个数printf("length of data[4]=%d", length ); //输出length of data[4]=4