用C#实现的十进制和十六进制的转换函数

1.十进制转十六进制：

public static string Ten2Hex(string ten)

{

ulong tenValue = Convert.ToUInt64(ten);

ulong divValue,resValue;

string hex = "";

do

{

divValue = (ulong)Math.Floor(tenValue/16);

resValue = tenValue%16;

hex = tenValue2Char(resValue) + hex;

tenValue = divValue;

}

while (tenValue >= 16);

if (tenValue != 0)

hex = tenValue2Char(tenValue) + hex;

return hex;

}

public static string tenValue2Char(ulong ten)

{

switch(ten)

{

case 0:

case 1:

case 2:

case 3:

case 4:

case 5:

case 6:

case 7:

case 8:

case 9:

return ten.ToString();

case 10:

return "A";

case 11:

return "B";

case 12:

return "C";

case 13:

return "D";

case 14:

return "E";

case 15:

return "F";

default:

return "";

}

}

2.十六进制转十进制：

public static string Hex2Ten(string hex)

{

int ten = 0;

for (int i=0,j=hex.Length-1 ; i<hex.Length ; i++)

{

ten += HexChar2Value(hex.Substring(i,1)) * ((int)Math.Pow(16,j));

j--;

}

return ten.ToString();

}

public static int HexChar2Value(string hexChar)

{

switch (hexChar)

{

case "0":

case "1":

case "2":

case "3":

case "4":

case "5":

case "6":

case "7":

case "8":

case "9":

return Convert.ToInt32(hexChar);

case "a":

case "A":

return 10;

case "b":

case "B":

return 11;

case "c":

case "C":

return 12;

case "d":

case "D":

return 13;

case "e":

case "E":

return 14;

case "f":

case "F":

return 15;

default:

return 0;

}

}