VB语言一个有关于循环的问题，比较难

Question

如果有一个变量
for x = 0 to 9
...
next
如果有两个变量
for x = 0 to 9
for y = 0 to 9
...
next
next
如果有三个变量
for x = 0 to 9
for y = 0 to 9
for z = 0 to 9
...
next
next
next
请问这种层数不确定的循环怎么写

Answer 1

n=3
k=1
for j = 1 to n
k = k*10
next
for i=1 to k
t = i
z = t mod 10
t = t \ 10
y = t mod 10
t = t \10
x = t
...
next