README_EN.md

709. To Lower Case

中文文档

Description

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

 

Example 1:

Input: "Hello"

Output: "hello"

Example 2:

Input: "here"

Output: "here"

Example 3:

Input: "LOVELY"

Output: "lovely"

Solutions

Python3

class Solution:
    def toLowerCase(self, s: str) -> str:
        return ''.join([chr(ord(c) | 32) if ord('A') <= ord(c) <= ord('Z') else c for c in s])

Java

class Solution {
    public String toLowerCase(String s) {
        char[] chars = s.toCharArray();
        for (int i = 0; i < chars.length; ++i) {
            if (chars[i] >= 'A' && chars[i] <= 'Z') {
                chars[i] |= 32;
            }
        }
        return new String(chars);
    }
}

C++

class Solution {
public:
    string toLowerCase(string s) {
        for (char& c : s)
            if (c >= 'A' && c <= 'Z')
                c |= 32;
        return s;
    }
};

Go

func toLowerCase(s string) string {
	sb := &strings.Builder{}
	sb.Grow(len(s))
	for _, c := range s {
		if c >= 'A' && c <= 'Z' {
			c |= 32
		}
		sb.WriteRune(c)
	}
	return sb.String()
}

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