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分享Convert.ToChar(Convert.ToInt16('A')+3)private char zhuanhuan(char c)
{
int i = c;
return Convert.ToChar(i + 3);
}Private Function ConvertToX(ByVal c As Char) As Char
Return CChar((c + 3))
End Function char[] a = new char[127];
for (int i = 0; i < a.Length; i++)
{
a[i] = Char.Parse( Console.ReadLine());
if (a[i] >= 'A' && a[i] <= 'Z')
a[i] += Convert.ToChar(3);
if (a[i] >= 'a' && a[i] <= 'z')
a[i] += Convert.ToChar(3);
Console.WriteLine(a[i]);
}
char c = (char)(('a' + 3) % 'z' + ('a' + 3) / 'z' * ('a' - 1)); // 'd'
char c2 = (char)(('x' + 3) % 'z' + ('x' + 3) / 'z' * ('a' - 1)); // 'a'