8. String to Integer (atoi)

 1 static int wing=[]()
 2 {
 3     std::ios::sync_with_stdio(false);
 4     cin.tie(NULL);
 5     return 0;
 6 }();
 7 
 8 class Solution 
 9 {
10 public:
11     int myAtoi(string str) 
12     {
13         int flag=1,i=0,base=0;
14         while(str[i]==‘ ‘)
15             i++;
16         if(str[i]==‘-‘||str[i]==‘+‘)
17         {
18             flag= (str[i]==‘-‘)?-1:1;
19             i++;
20         }
21         while(isdigit(str[i]))
22         {
23             if(base>INT_MAX/10||(base==INT_MAX/10&&str[i]-‘0‘>7))
24                 return flag==1? INT_MAX:INT_MIN;
25             base=10*base+(str[i++]-‘0‘);
26         }
27         return base*flag;
28     }
29 };