s = ""

   For i = 1 To 5

      a(i) = 0

   Next i

   For i = 2 To 5

      For j = i To 5

         If j Mod i = 0 Then a(j) = 1 - a(j)

      Next j

   Next i

   For i = 1 To 5

      If a(i) = 1 Then s = s + Str(i)

   Next i

   Text1.Text = s

运行该程序段后，Text1中显示的内容为（   ）

        PRIVATE SUB FORM_CLICK

        DIM A（4，4） AS INTEGER

        FOR I = 1 TO 4

           FOR J= 1 TO 4

              IF {#blank#}1{#/blank#}

                A（I，J）=1

              {#blank#}2{#/blank#}

               A（I，J）=0

              END IF

              PRINT A（I，j）;

              {#blank#}3{#/blank#}

            PRINT

              {#blank#}4{#/blank#}

        END SUB

Dim c As Integer,a(0 To 5) As Integer

For i = 1 To 5

  a(i) = i

Next i

c = 0

For i = 1 To 5

  x = Int(Rnd * 5 + 1)

  If a(x Mod 5) = i + 2 Then c = c + 1

  If c = x Then Exit For

  i = i - 1

Next i

运行该程序后，变量c的值不可能是（  ）

转换方法：先从右往左将二进制数分割成 4 位一组，若最左边的一组不足4位，则用 0 将高位补足，然后将每 4 位二进制数转换为 1 位十六进制数。