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

1
2
3
4
5
6
7
8
9
10
11
class Solution {
public:
int myAtoi(string str) {
if(str == "")
return 0;
stringstream ssTmp(str);
int res;
ssTmp >> res;
return res;
}
};