Brooke

一、題目

Given a string s, return the string after replacing every uppercase letter with the same lowercase letter.

 

Example 1:

Input: s = "Hello" Output: "hello"

Example 2:

Input: s = "here" Output: "here"

Example 3:

Input: s = "LOVELY" Output: "lovely"

 

Constraints:

• 1 <= s.length <= 100
• s consists of printable ASCII characters.

 

二、程式作法

/*use ascii letter*/
public class Solution
{
    public string ToLowerCase(string s)
    {
        char[] cs = s.ToCharArray();
        for (int i = 0; i < cs.Length; i++)
        {
            if (cs[i] >= 'A' && cs[i] <= 'Z')
                cs[i] += ' ';
        }
        return new string(cs);
    }
}

/*use ascii number*/
/*
public class Solution
{
    public string ToLowerCase(string s)
    {
        char[] cs = s.ToCharArray();
        for (int i = 0; i < cs.Length; i++)
        {
            if ((int)cs[i] >= 65 && (int)cs[i] <= 90)
                cs[i] = (char)((int)cs[i] + 32);
        }
        return new string(cs);
    }
}
*/

 

三、思路筆記

略