// Package q8 implements a solution for https://leetcode.com/problems/string-to-integer-atoi/
package q8

const (
	MIN = -(1 << 31)
	MAX = 1<<31 - 1
)

func myAtoi(s string) int {
	sign := 0
	num := 0

Loop:
	for i := range len(s) {
		c := s[i]

		switch c {
		case '-':
			if sign != 0 {
				break Loop
			}
			sign = -1

		case '+':
			if sign != 0 {
				break Loop
			}
			sign = 1

		case ' ':
			if sign != 0 {
				break Loop
			}

		default:
			if c < '0' || c > '9' {
				break Loop
			}
			if sign == 0 {
				sign = 1
			}
			num = num*10 + int(c-'0')
			if sign*num < MIN {
				num = -MIN
				break Loop
			}
			if sign*num > MAX {
				num = MAX
				break Loop
			}
		}
	}

	return sign * num
}

var _ = myAtoi