Reverse digits of an integer.
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class Solution { public: int reverse(int x) { ?????? long ans=0;//long ???????????????????????? int min=1<<31,max=-min-1;//???????????????<<???????????????while(x!=0){ ans=ans*10+x%10; x=x/10; } if(ans>max||ans<min) return 0; return ans; } };
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unsigned int 0???4294967295
int -2147483648???2147483647 ???-2^31~???2^31-1??????//????????????????????????1??????
unsigned long 0???4294967295
long -2147483648???2147483647
long long???????????????9223372036854775807
long long???????????????-9223372036854775808
unsigned long long???????????????1844674407370955161
__int64???????????????9223372036854775807
__int64???????????????-9223372036854775808
unsigned __int64???????????????18446744073709551615
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