Leetcode question 7: integer inversion

topic

Given a 32-bit signed integer, you need to invert the digits on each of the integers. If the integer overflows after the inversion, it returns 0

For example

• Input: 123 Output: 321
• Input: -123 Output: -321
• Input: 120 Output: 21

Parsing

Keep taking more than 10

GO answer

func reverse(x int) int {
    
    
    max := 1 << 31
    min := 0 - max
    rev := 0

	for {
    
    
		if (x == 0) {
    
    
			break
		}
		rev = rev * 10 + x % 10
		if (rev > max || rev < min) {
    
    
			return 0
		}
		x = x / 10
	}

    return rev
}