Excel VBA類型不匹配

Question

在行If infl > (fc - WC(j)) * dz(j) Then我不斷收到錯誤「類型不匹配」，它突出顯示行中的-。我現在知道什麼會導致這個錯誤？

Option Explicit 

Dim dz() As Double 
Dim WC() As Double 
Dim fc() As Double 
Dim NL, i As Integer 

Dim sumdrain As Double 
Dim infl As Double 

Sub infilt() 
    Dim j As Integer 
    j = 1 

    While (infl > 0) And (j <= NL) 
    If infl > (fc - WC(j)) * dz(j) Then 
     infl = infl - (fc - WC(j)) * dz(j) 
     WC(j) = fc 
    Else 
     WC(j) = WC(j) + infl/dz(j): infl = 0 
    End If 
    j = j + 1 
    Wend 

    If infl > 0 Then 
    sumdrain = sumdrain + infl 
    infl = 0 
    End If 

End Sub 

Answer 1

fc是一個數組。你不能從中減去。你可能意思是fc(something)。