那你检查 判断出来的 数组下标。
使用 监视，j 的值。

有一种情况，就是Pc变量中保存的不是一个字母。

Pc 的字母是连续的，可以直接计算，而不是使用IF块进行判断。
j=114-asc(pc)  '在手机上，估算的值
然后判断一下j是否大于0
if j<0 then  j =0

求VB挂轮比代码
比如，text1.text，是个double，比如是0.8745865231，求(A/B)*(C/D),A，B,C,D均是30到100的整数，要求输出(A/B)*(C/D)最接近text1.text里的数值，然后输出一个(A/B)*(C/D)

比如最终输出52/68*86/61

谢谢大侠

(51/55)*(83/88)=.874586776859504

Dim a As Long, b As Long, c As Long, d As Long
Dim m As Double, n As Double
Dim k As Double

Dim a1 As Long, b1 As Long, c1 As Long, d1 As Long
Dim m1 As Double


k = 1
For a = 30 To 100
For b = 30 To 100
For c = 30 To 100
For d = 30 To 100
m = (a / b) * (c / d)
n = Abs(m - 0.8745865231)
If n < k Then
    k = n
    a1 = a
    b1 = b
    c1 = c
    d1 = d
    m1 = m
End If
Next d
Next c
Next b
Next a

Print "("; a1; "/"; b1; ")*("; c1; "/"; d1; ")="; m1
Debug.Print "(" & a1 & "/" & b1 & ")*(" & c1 & "/" & d1 & ")=" & m1

用数组和循环。