????????
???????????????? ???????[ 2010/7/29 15:41:07 ] ????????
?????????????????CPU??x86?????治????64GB???????????????????????Windows 2003???IE??汾???????6.0????PICT???????????????????????????????????????????????????????????????????????????Ч???????????????????Ч??????
????3. С???????Guard?????
??????????????????????????????Ч?????????磬?????′????У?if???????????????A<=0??????
int func(int A?? int B?? int C)
{
if (A <= 0) return ERROR;
...
}
???????????ж?????????????????????????????????????μ????????????????У?A??????-1?? 0?? 1??
A: -1?? 0?? 1
B: -1?? 0?? 1
C: -1?? 0?? 1
????????????????????????????????????9????????????
A B C
0 1 -1
1 -1 1
-1 0 -1
1 1 0
-1 -1 0
0 0 1
1 -1 -1
-1 1 1
0 -1 0
1 0 0
????????9???????????У???6????????????if???????????????A<=0?????3?????????????????к????????????ζ?????1/3??B??C???????????????????????????????????????????????????????ж????????????????????????????????????????? ??
??????????????????????????????????????????????????????ж??????桱??Negative????????????????????????????????????????????????????????Χ?????磬?????????????????func?????????????????
A: 1?? 10?? 100
B: -1?? 0?? 1
C: -1?? 0?? 1
?????????????????????????????????????????A: 0??B: 0?? C: 0?????????????????????????????????????????????A??B??C??????????????????????????????????????????????????
??????????????????PICT??????У??????????"~"?????????invalid????????磬??????????У?????A????0???????????
A: ~0?? 1?? 10
B: -1?? 0?? 1
C: -1?? 0?? 1
????PICT?????????Ч???????????????????????????????Ч?????????????????????????????2???????????
A B C
1 1 -1
1 0 1
10 -1 -1
1 -1 0
10 0 -1
10 -1 1
10 0 0
10 1 0
1 1 1
~0 0 -1
~0 -1 0
~0 1 1
??????
???·???
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