擅长:python、mysql、java
<p>试着用这个在0-20范围内有效</p>
<pre><code>low = input("Give the lower bound of the number range: ")
high = input("Give the upper bound of the number range: ")
low = int(low)
high = int(high)
for n in range(low, high+1):
if n <= 1:
print(n, "cannot be prime")
elif n == 2 or n == 3:
print(n, "is a prime")
elif n % 2 == 0 or n % 3 == 0:
print(n, "is not a prime")
else:
print(n, "is a prime")
</code></pre>