Case swapping

Case swapping

Description:

Given a string, swap the case for each of the letters.

e.g. CodEwArs --> cODeWaRS

Examples

Kata.Swap("") == ""
Kata.Swap("CodeWars") == "cODEwARS"
Kata.Swap("abc") == "ABC"
Kata.Swap("ABC") == "abc"
Kata.Swap("123235") == "123235"
using System;
using System.Linq; public static class Kata
{
public static string Swap(string str)
{
return string.Join(string.Empty, str.Select(character => char.IsLower(character) ? char.ToUpper(character) : char.IsUpper(character) ? char.ToLower(character) : character));
} //public static string Swap(string str)
//{
// str = string.Join(string.Empty, str.Select(Selector));
// return str; //your code here
//} //public static char Selector(char character)
//{
// char tempCharacter = character;
// if (char.IsLower(character))
// {
// tempCharacter = char.ToUpper(character);
// }
// else if (char.IsUpper(character))
// {
// tempCharacter = char.ToLower(character);
// }
// return tempCharacter;
//}
}

其他人的解法

需要学习的是:char.ToUpper以及char.ToLower本身可以处理非大小写的字符,不需要另外多一个判断

using System;
using System.Linq; public static class Kata {
public static string Swap(string str) {
return String.Concat(str.Select(c => Char.IsUpper(c) ? Char.ToLower(c) : Char.ToUpper(c)));
}
}
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