16进制与10进制相互转换（VB）

来源：百度知道 编辑：UC知道 时间：2024/05/05 20:27:36
’我也知道可以通过ten=clng("&H"+sixteen)或sixteen=hex(ten)来相互转换，但是现在我希望把下面这两个小算法也修改得完全正确。请大虾帮忙！！！谢谢

'把16进制数转换成10进制数
Public Function hextodecimal(str2 As String) As Long
Dim i As Long, a As Variant, k As Long
k = 0
For i = Len(str2) - 1 To 0 Step -1
a = Asc(LCase(Mid(str2, Len(str2) - i, 1))) '统一求得各个字符的小写状态下的字符所对应的ASCII值
a = IIf(a >= 48 And a <= 57, a - 48, a - 55)
'0的ASCII码为48，字母a的ASCII码为65,而16进制下的A对应为10进制下的10
'如果a在16进制下为 0 至 9 的数，则-------
'如果a在16进制下为 a 至 f 的数，则-------
k = k + (16 ^ i) * a '累加,就像 12345=1*10^4+2*10^3+3*10^2+4*10^1+5*1^0
Next
hextodecimal = k '得到的这个返回值 K 就是转换后的10进制数
End Function

'10进制转换成16进制数
Public Function decimaltohex(x As Long) As String
Dim a As String
Dim r As String
Do While x > 0
r = x Mod 16
x = x \ 16
r = IIf(r > 9, Chr(Asc(r) + 7), r

Option Explicit

Public Function hextodecimal(str2 As String) As Long
Dim i As Long, a As Variant, k As Long
k = 0
For i = Len(str2) - 1 To 0 Step -1
a = Asc(LCase(Mid(str2, Len(str2) - i, 1)))
a = IIf(a >= 48 And a <= 57, a - 48, a - 87)

注意小写字母a的ASCII码不是65,而是97,大写字母A的ASCII码才是65!!!!
k = k + (16 ^ i) * a
Next
hextodecimal = k
End Function

Public Function decimaltohex(x As Long) As String
Dim a As String
Dim r As String
Do While x > 0
r = x Mod 16
x = x \ 16
r = IIf(r > 9, Chr(Asc(r - 9) + 16), r)
'此处如果不减9,碰到r是两位数时,譬如13、14或15时,则只求出了前一位数字"1"的ASCII码49,造成结果错误！！！！
a = r + a
Loop
decimaltohex = a
End Function

已经运行过了，不知楼主是否满意。