2015年12月31日 星期四

TO-Z2A:101年正式題第3題-子題2-編碼

101年正式題第3-子題2-編碼

題目大意:讀入一串只有01的字串,由下列編碼表找出對應的字元
二進制
字元

二進制
字元
00
A
11100
4
01
B
11101
5
100
0
111100
6
101
1
111101
7
1100
2
111110
8
1101
3
111111
9

輸入檔(in.txt)
6
1111001111011111101111111000010001
101110011101110111000010101
11100110111001011110001
111011100110111100110100
1011100100111111110000
1011100110111100110001

輸出檔(ou.txt)
6789,0A0B
1253,2A1B
4321,4B
5234,3A
1209,2A
1234,2B

解題參考說明:
讀入的字串由第1個位元開始,
b若為1  {判斷第5個連續1 (1)轉成字元}
b若不為1 (2) 轉成字元
轉成字元:假設第j個位元是連續51或第j個字元是0
( j之前連續1的個數one 、第j+1位元為d)
        換算碼 k = 2*one+d+1 由右字串找 tbl= "AB0123456789"
    one的個數要歸零

程式碼如下:
   Dim tbl = "AB0123456789"
    FileOpen(1, "in.txt", OpenMode.Input)
    FileOpen(3, "ou.txt", OpenMode.Output)
    Dim fn As Integer = 1
    Dim n As Short = LineInput(fn)
    For i = 1 To n
        Dim line As String = LineInput(fn)
        Dim one As Short = 0   '位元連續1的個數
        Dim dcnt As Short = 0
        Dim k As Integer
        For j = 1 To line.Length
            Dim b As Char = Mid(line, j, 1)   '1個位元
            If b = "1" Then
                one += 1  
                If one = 5 Then 
                    j += 1  ' (1)51直接 以後1位元判斷是 8 9
                    k = 2 * one + 1 + Mid(line, j, 1)
                    If dcnt = 4 Then Print(3, ",") '已印4個數字:加 才接 aAbB
                    Print(3, Mid(tbl, k, 1))
                    dcnt += 1  '1個數字
                    one = 0
                End If
            Else ' (2) 讀入的是 0 ,一次處理後2
                j += 1  '以左邊 1 的個數 右邊01判斷
                k = 2 * one + 1 + Mid(line, j, 1)
                If dcnt = 4 Then Print(3, ",") '已印4個數字:加 才接 aAbB
                Print(3, Mid(tbl, k, 1))
                dcnt += 1
                one = 0
            End If
        Next j
        PrintLine(3)
    Next

    End