为什么要多用一步for（i=8;i>=0;i--)，直接用for（j=0;j<=8;j++)不可以吗？

Answer 1

MLQZVUBYRRMINNUDDQTYGSELEHORMCRDQUXXNMYBEUUAEDRTLPCPJQPAGSUHATIZUMOGTQADACNQLOVSFNWEQFCZZMWIXDDRUYPVXUZFJNERYKKJPWHKSKGMKQEVIXSNGPZNRUYUWFSTFCGDEWZFPCMKROQGWCWZNKWICFUYEPQROEAAQOCWSGSBXQGQEDOQGVYYTPFHJLQDIFIMBDIHFMWMRTZVUYSGUUZLDIMFSPBSENJDIRICUJSEADAXPUZVXKUHUAJBNPWFSSHCRTSFIILCHMZYLHVAFRGZFJJANZJWFVSWAOEOYIYIMJDCLZFLLFCQXZMPSWAHLSVUUDNHFRENNJTGAYFAEGDTXBICJMYGMZTREJSIYLLJGMASOMCDQUYFAOXSPZMZSXPRUHKATLKPYVOSLSTTLBTJDMGLWLAFZIVPEJYSHRELREJLXLXKKUWBWSEXXKXZEJFXUKOBIEHHWTDGQOTSRXUAXRWRDZKQXERACRQMQDWZYLDPLILIPMHAFREYUYTONFVRUTPVAPIXAXAXBDDIORCFMYMMLYOCGDUZSCZMQJWXZSUQTXAGONNMXBXMWFOKWOBBBOACYGSZMZSGOGKICYBYWIOAQSGJHEGIOAQTNWCXCOHBWZWRJGMYLYHXEQDJBYLVRQVGQSFYSIJBNGBVREEYHWMBVVNGQUXXCKXRZGBNJRVBVBRMRTZCFSFYQNQYFOYLZBGDCXROOOQKQVQFTTOQWAJNRYCSNXNCNHUEYETJZDKECIEGWCMQXILNQXAOOCJKJPYOSMYIHIVFRBPPMLGVLBMGKNRMSYYIWJFHYEBYCAAEFQWZIMQEEEGLIOBVTXGLXNDNORCMVBKUOOCMDVUZSBOYKGDYAGZWGJGTVXJWMZZBXZVHHBKNKSUMYVIFYBTPBWJMJDPRJYHVFIVTOOGCBYJDLJIKPMGTMNZAHGHAVVWYEBQUANRJZTZVHVZUGBYNJXBOSWEBXWQUIZZVEBRFZLVPBHHEYSPLBDTTYZMUYQNQMMJYJKFLXDQDBXPTEAZFJGHLUMLXZWJOHSUGPBXHHREJYHJPJPFEGIATWMWCXMYAFJWSWQBTXDQNGTRWSNIRYORZTDPIBOTTTEIAFCFMPRPWIDXKNWDCHNZCCPVMKYXGJSWMNLERNRQKAMKWYOBOKOAMFHEBBISAPKZPCPLPXWOYNANANMABXCFSZPVACBWBYLVWRQFBBLOVALVGCZICKSQUJVYEBRYOAJJPWJZWKZLHKXADPKWNZTNOHFQCIMDFJQGIHXDAOLWUMIYHVFOIJKQZVDDHVKVBYKOCPJTBRHNHBIKJUIYZTXCTGSEANHLISGYIOXBYCYSIBYEOVZQVEDJZDXBSOMLNCPSFZRFODCPCLYYDFIOKNHXZZBNZCPMPGIVHQQZWRELBWXEHEHXZZWSMQOODVFBOSXRZZHNNWDSZCJOKKAKOFZFKAGCJDAEDCMVLZDMWZOTLBFQUEKGXDMXXVCLAKSIFTGHVKXCIMQUEDIEEUUBZOSRNMCAEHVKIYUGHLUYHTTGPJXUORJDKPQAHBQYLRNRLSCQFBXXUESGNIEUKXICGRQWSIVJXZPCGFBCMIVQILXTGKIPTPFLVPWUE

Answer 2

这两个循环效果是一样的。