class Solution {
    public int myAtoi(String str) {
        int k = 0;
        boolean flag = false;
        char s[] = str.toCharArray();
        while(k < str.length() && s[k] == ' ')k++;
        if(k >= str.length()) return 0;
        if(s[k] == '+') k++;
        else if(s[k] == '-') {
            k++;
            flag = true;
        }
        double res = 0;
        while(k < str.length() && s[k] >= '0' && s[k] <= '9') {
            res = res * 10 + s[k] - '0';
            k++;
        }
        if(flag) res = res * -1;
        if(res > Integer.MAX_VALUE)return Integer.MAX_VALUE;
        if(res < Integer.MIN_VALUE)return Integer.MIN_VALUE;

        else return (int)res;


    }
}