为什么这样就不能输出正确答案？

Question

td=num（num%100-num%10）/10;

Answer 1

PCYYTAHXLCLRBFMGWQJEYIRNXOHHNDBOUFHUXDDTMWHTKGGMDJMCMWGGLKHDQTTHSPBRGNJADDUHYOIUEOBLHOWDWAZCZADMDJJEHAUBBBWKLCQMSILLZGXLYDQTXQKVFFUNRAMMYOLRKLFIVEORLBRKVNHQRIRHICVQSVBOUTJJIKOYVLRRLXLEONKSSHXHBRBFIZROVDGHKOHEKYUHXKLBIBORLLBBISSBHYYFYUMGJPZMJMBEAFFYRBBOCWGSFCFFHURRRHIYSSCQHEKQWYSPZLIYLCCYIOYBAQXSCPFUDXENUUHXMLEOSMYLYLOVONKIIUMMRUHJFMHVESMJQYHXNKKEXSTWXKWWGDAPIJCXJDZQZSVYFIRXMZZWXUOUFWFLYORBERXEVPBRSSQTDHDRHGEBIRUOLRLYKAOVVVYGWAXPMGZWMPCEEKWQDBLXMANOUQAQDXLYDTVOAUBNDAAQKMDQQNDUNNPVNQVCVOLBYELMVJTANATQOECCTCPDTWGKXHDWGGKAQEPZIIFXKBBBYILADWWNTGFJGMZOOVITIJERVCYKABXPCJZCHHATQIXXRORYLDAKXANSZWSPIYOLKSCPFDNWGJKOISPVYBHZMCPVCPVODWMABISMATSJVVFISCMVPSOUELHECJMCUNOOIVRISWJFMQENNKROLFTQCSJCOUBCCNJNMGOXBOFPKUHKNUNLZFM

Answer 2

问题不清晰，没把情况说明白