public class Solution {    public int myAtoi(String str) {        str=str.trim();        int size=str.length();        if(str==null||size==0)            return 0;        double res=0;        boolean isPositive=true;        for(int i=0;i
     
      ='0'&&str.charAt(i)<='9')                {                    res*=10;                    res+=str.charAt(i)-'0';                }                else                    break;            }        }        if(isPositive==false)            res=0-res;        if (res > Integer.MAX_VALUE)            return Integer.MAX_VALUE;             if (res < Integer.MIN_VALUE)            return Integer.MIN_VALUE;        return (int)res;    }}