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s = "happy": n = Len(s)
For i = 1 To n
x = Int(Rnd * n + 1)
c = Mid(s, x, 1)
If x Mod 2 = 0 Then
c = Chr((Asc(c) - Asc("a") + 1) Mod 26 + Asc("a"))
Else
c = Chr(Asc("a") + 25 - (Asc(c) - Asc("a")))
End If
s1 = c + s1
Next i
则运行本程序段后，变量s1的值不可能为（ ）
| A．"bbkkq" | B．"qbqsq" | C．"kksqk" | D．"gboqx" |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
