1樓：
function isprime(byval n as integer) as boolean '是素數返回true，不是素數返回false
dim i as integer
if n < 2 then isprime = false: exit function else isprime = true
for i = 2 to n - 1
if n mod i = 0 then
isprime = false
exit function
end if
next i
end function
private sub command1_click()dim i as long, sum as longfor i = 200 to 300
if isprime(i) then sum = sum + i * i
next
print "200－1000之間的所有素數的平方和=" & sumend sub
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