vf编程啊 将华氏温度F变成摄氏温度C.(公式为C=5*(F-32)/9)

1.将华氏温度F变成摄氏温度C.(公式为C=5*(F-32)/9)
input "请输入华氏温度：" to f
"对应的摄氏温度为：",5*(f-32)/9,"摄氏度"
2.设s=1*2*3*.*n 求s不大于400000时的最大的n
n=0
s=1
do whil s400000
exit
else
s=s*n
endi
endd
"n为:",n-1,"s为:",s
3.输入a和n的值,求s=a+aa+aaa+...+aaa...(n个a)的值
acce "请输入a的傎：" to a
input "请输入n的傎：" to n
he=0
cs=1
zfc=""
do while cs