MyAtoi.java

package LeetcodePractice;
public class MyAtoi {
    public static void main(String[] args) {
        System.out.println(myAtoi("42")); 
        System.out.println(myAtoi("   -042")); 
        System.out.println(myAtoi("1337c0d3")); 
        System.out.println(myAtoi("0-1")); 
        System.out.println(myAtoi("words and 987"));
        System.out.println(myAtoi("-91283472332"));
    }

    public static int myAtoi(String s) {
        int i = 0, n = s.length(), sign = 1, result = 0;

    
        while (i < n && s.charAt(i) == ' ') {
            i++;
        }

        
        if (i < n) {
            char c = s.charAt(i);
            if (c == '-') {
                sign = -1;
                i++;
            } else if (c == '+') {
                i++;
            }
        }

       
        while (i < n && Character.isDigit(s.charAt(i))) {
            int digit = s.charAt(i) - '0';

            
            if (result > (Integer.MAX_VALUE - digit) / 10) {
                return (sign == 1) ? Integer.MAX_VALUE : Integer.MIN_VALUE;
            }

            result = result * 10 + digit;
            i++;
        }

        return result * sign;
    }
}