26进制数与10进制数互转(字母和数字互换)

我不是女神ヾ 2022-01-06 12:51 510阅读 0赞

public class Twenty\_six\_Sys  
\{  
private static string\[\] Level = \{"A", "B", "C", "D", "E", "F", "G","H", "I", "G", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T","U", "V", "W", "X", "Y", "Z" \};  
/// <summary>  
/// 数字26进制，转换成字母，用递归[**算法**][Link 1]  
/// </summary>  
/// <param name="value"></param>  
/// <returns></returns>

public static string Num\_to\_letter(int value)  
\{  
//此处判断输入的是否是正确的数字，略（正在表达式判断）  
int remainder = value % 26;  
//remainder = (remainder == 0) ? 26 : remainder;  
int front = (value - remainder) / 26;  
if (front < 26)  
\{  
return Level\[front\] + Level\[remainder\];  
\}  
else  
\{  
return Num\_to\_letter(front) + Level\[remainder\];  
\}  
//return "";  
\}  
/// <summary>  
/// 26进制字母转换成数字  
/// </summary>  
/// <param name="letter"></param>  
/// <returns></returns>  
public static int Letter\_to\_num(string str)  
\{  
//此处判断是否是由A-Z字母组成的字符串，略（正在表达式片段）  
char\[\] letter = str.ToCharArray(); //拆分字符串  
int reNum = 0;  
int power = 1; //用于次方算值  
int times = 1; //最高位需要加1  
int num = letter.Length;//得到字符串个数  
//得到最后一个字母的尾数值  
reNum += Char\_num(letter\[num - 1\]);  
//得到除最后一个字母的所以值,多于两位才执行这个函数  
if (num >= 2)  
\{  
for (int i = num - 1; i > 0; i--)  
\{  
power = 1;//致1，用于下一次循环使用次方计算  
for (int j = 0; j < i; j++) //幂，j次方，应该有函数  
\{  
power \*= 26;  
\}  
reNum += (power \* (Char\_num(letter\[num - i - 1\]) + times)); //最高位需要加1，中间位数不需要加一  
times = 0;  
\}  
\}  
//Console.WriteLine(letter.Length);  
return reNum;  
\}  
/// <summary>  
/// 输入字符得到相应的数字，这是最笨的方法，还可用ASIICK编码；  
/// </summary>  
/// <param name="ch"></param>  
/// <returns></returns>  
private static int Char\_num(char ch)  
\{  
switch (ch)  
\{  
case 'A':  
return 0;  
case 'B':  
return 1;  
case 'C':  
return 2;  
case 'D':  
return 3;  
case 'E':  
return 4;  
case 'F':  
return 5;  
case 'G':  
return 6;  
case 'H':  
return 7;  
case 'I':  
return 8;  
case 'J':  
return 9;  
case 'K':  
return 10;  
case 'L':  
return 11;  
case 'M':  
return 12;  
case 'N':  
return 13;  
case 'O':  
return 14;  
case 'P':  
return 15;  
case 'Q':  
return 16;  
case 'R':  
return 17;  
case 'S':  
return 18;  
case 'T':  
return 19;  
case 'U':  
return 20;  
case 'V':  
return 21;  
case 'W':  
return 22;  
case 'X':  
return 23;  
case 'Y':  
return 24;  
case 'Z':  
return 25;

\}  
return -1;  
\}  
\}

转载于:https://www.cnblogs.com/mol1995/p/6627099.html

[Link 1]: http://lib.csdn.net/base/datastructure