Leetcode008. String to Integer (atoi)

1 /*improvement on dealing with overflow accroding to this:2  * https://discuss.leetcode.com/topic/57452/c-solution-beats-1003  * 4 * Being careful about the Int_max and int_min5 * This atoi isn't thinking about special char like dot and so on.6  */7 8 classSolution {9  Public:Ten     intMyatoi (stringstr) { One        inti,nega_sign=1; A        Long Long intRe=0;//long long re to avoid overflow -         for(i=0; I<str.size (); i++)//Skip to all the blank in the front of the string -        { the            if(str[i]!=' ') Break; -        } -        if(str[i]=='+') i++;//deal with Signature -        Else if(str[i]=='-') {nega_sign=-1; i++;} +         while(I<str.size () &&isdigit (Str[i])) - /*When the string was over or the current char was not a valid integral number,no more conversion'll be PERFORMED. + */ A        { atre=re*Ten+str[i]-'0'; -                if(nega_sign==-1&&-1*re<=int_min)returnInt_min;//Overflow -                Else if(nega_sign==1&&re>=int_max)returnInt_max; -i++; -        } -        returnre*nega_sign; in     } -};

Leetcode008. String to Integer (atoi)