String to Integer (atoi)

Desicription

Implement atoi to convert a string to an integer.

Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases.

Notes: It is intended for this problem to be specified vaguely (ie, no given input specs). You are responsible to gather all the input requirements up front.

Solution

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class Solution {
public:
    int myAtoi(string str) {
        if(str == "")
            return 0;
        stringstream ssTmp(str);
        int res;
        ssTmp >> res;
        return res;
    }
};