这段程序能停止吗？

  #include <stdio.h> #include <stdlib.h> int main() { unsigned int i; for(i=5; i>=0; i--) { printf("This is %d !/n",i); getch(); } return 0; }

嘿嘿！试一试吧！

结果是：

This is 5 !
This is 4 !
This is 3 !
This is 2 !
This is 1 !
This is 0 !
This is -1 !
This is -2 !
This is -3 !
This is -4 !

... ...

无符号的整数他永远是无符号？